Flaky-test: LockManagerTest.updateValue

org.apache.pulsar.metadata.LockManagerTest is flaky. The updateValue test method fails sporadically.

[example failure](https://github.com/apache/pulsar/runs/4735075630?check_suite_focus=true#step:8:4884)

```
java.lang.AssertionError: expected [value-2] but found [lock-1]
at org.testng.Assert.fail(Assert.java:99)
at org.testng.Assert.failNotEquals(Assert.java:1037)
at org.testng.Assert.assertEqualsImpl(Assert.java:140)
at org.testng.Assert.assertEquals(Assert.java:122)
at org.testng.Assert.assertEquals(Assert.java:629)
at org.testng.Assert.assertEquals(Assert.java:639)
at org.apache.pulsar.metadata.LockManagerTest.updateValue(LockManagerTest.java:148)
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:566)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
at org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
at org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)

```

Start with org.apache.pulsar.metadata.LockManagerTest.updateValue and the linked GitHub Actions failure, especially the assertion at LockManagerTest.java:148. Reproduce the sporadic expected-value failure, identify its cause, and verify that the test no longer fails intermittently.

Written by the indexing model from the issue text.