Unable to build with latest JDK

Hi Timber,

I just checked out this Timber repo and ran `gradle test`. However I'm seeing some `robolectric` issues.

```
PROMPT> gradle test
Starting a Gradle Daemon, 1 incompatible Daemon could not be reused, use --status for details

> Task :timber:compileDebugKotlin
w: /Users/johndoe/timber-master/timber/src/main/java/timber/log/Timber.kt: (20, 18): There's a cycle in scopes for that type. Most probably, there's a companion object that inherits some nested class (see KT-21515).
Such code is currently unstable, and its behavior may change in future releases
w: /Users/johndoe/timber-master/timber/src/main/java/timber/log/Timber.kt: (144, 66): 'isLoggable(Int): Boolean' is deprecated. Use isLoggable(String, int)
w: /Users/johndoe/timber-master/timber/src/main/java/timber/log/Timber.kt: (153, 11): Name shadowed: message
w: /Users/johndoe/timber-master/timber/src/main/java/timber/log/Timber.kt: (274, 13): There's a cycle in scopes for that type. Most probably, there's a companion object that inherits some nested class (see KT-21515).
Such code is currently unstable, and its behavior may change in future releases

> Task :timber:compileDebugJavaWithJavac
warning: [options] source value 7 is obsolete and will be removed in a future release
warning: [options] target value 7 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
3 warnings

> Task :timber:compileDebugUnitTestJavaWithJavac
warning: [options] source value 7 is obsolete and will be removed in a future release
warning: [options] target value 7 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
3 warnings

> Task :timber:testDebugUnitTest
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.robolectric.util.ReflectionHelpers$7 (file:/Users/johndoe/.gradle/caches/modules-2/files-2.1/org.robolectric/shadowapi/3.8/d638f001e81ef737bb35db2964312360cc996a94/shadowapi-3.8.jar) to method java.lang.ClassLoader.getPackage(java.lang.String)
WARNING: Please consider reporting this to the maintainers of org.robolectric.util.ReflectionHelpers$7
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

timber.log.TimberTest > nullMessageWithoutThrowable FAILED
java.lang.RuntimeException: java.lang.RuntimeException: java.lang.IllegalAccessException: Can not set static final org.robolectric.internal.IShadow field org.robolectric.shadow.api.Shadow.SHADOW_IMPL to org.robolectric.internal.bytecode.ShadowImpl
at org.robolectric.util.ReflectionHelpers.setStaticField(ReflectionHelpers.java:192)
at org.robolectric.internal.bytecode.Sandbox.configure(Sandbox.java:63)
at org.robolectric.internal.SandboxTestRunner.configureShadows(SandboxTestRunner.java:205)
at org.robolectric.internal.SandboxTestRunner$2.evaluate(SandboxTestRunner.java:223)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:130)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:42)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.robolectric.internal.SandboxTestRunner$1.evaluate(SandboxTestRunner.java:84)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:119)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:182)
at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:164)
at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:414)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
at java.base/java.lang.Thread.run(Thread.java:832)

Caused by:
java.lang.RuntimeException: java.lang.IllegalAccessException: Can not set static final org.robolectric.internal.IShadow field org.robolectric.shadow.api.Shadow.SHADOW_IMPL to org.robolectric.internal.bytecode.ShadowImpl
at org.robolectric.util.ReflectionHelpers.setStaticField(ReflectionHelpers.java:177)
at org.robolectric.util.ReflectionHelpers.setStaticField(ReflectionHelpers.java:190)
... 42 more

Caused by:
java.lang.IllegalAccessException: Can not set static final org.robolectric.internal.IShadow field org.robolectric.shadow.api.Shadow.SHADOW_IMPL to org.robolectric.internal.bytecode.ShadowImpl
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwFinalFieldIllegalAccessException(UnsafeFieldAccessorImpl.java:76)
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwFinalFieldIllegalAccessException(UnsafeFieldAccessorImpl.java:80)
at java.base/jdk.internal.reflect.UnsafeQualifiedStaticObjectFieldAccessorImpl.set(UnsafeQualifiedStaticObjectFieldAccessorImpl.java:77)
at java.base/java.lang.reflect.Field.set(Field.java:778)
at org.robolectric.util.ReflectionHelpers.setStaticField(ReflectionHelpers.java:175)
... 43 more
```

# Info

timber git hash: `4fd8e2a09c81931e9c9b004f45aea2937835278c`.

Android Studio 4.2.1

macOS 11.4

Start by reproducing the failure with `gradle test` and inspect the Robolectric 3.8 setup behind `timber.log.TimberTest`, especially `nullMessageWithoutThrowable`. Trace the illegal reflective access failure and verify the relevant test configuration against the latest JDK. Done means the test suite completes successfully without this Robolectric initialization error.

Written by the indexing model from the issue text.