Test failure in com.aws.ssa.keyspaces.retry.AmazonKeyspacesExponentialRetryPolicyTest

When building with `mvn clean package` a test fails with the following error.

```
-------------------------------------------------------------------------------
Test set: com.aws.ssa.keyspaces.retry.AmazonKeyspacesExponentialRetryPolicyTest
-------------------------------------------------------------------------------
Tests run: 16, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.4 sec <<< FAILURE!
testConfig(com.aws.ssa.keyspaces.retry.AmazonKeyspacesExponentialRetryPolicyTest) Time elapsed: 0.027 sec <<< ERROR!
com.typesafe.config.ConfigException$BadValue: exponential-retry-example.conf @ file:/home/ubuntu/amazon-keyspaces-java-driver-helpers/target/test-classes/exponential-retry-example.conf: 17: Invalid value at 'advanced.retry-policy.min-wait': Could not parse time unit 'mills' (try ns, us, ms, s, m, h, d)
at com.typesafe.config.impl.SimpleConfig.parseDuration(SimpleConfig.java:771)
at com.typesafe.config.impl.SimpleConfig.getDuration(SimpleConfig.java:360)
at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
at com.datastax.oss.driver.internal.core.config.typesafe.TypesafeDriverExecutionProfile.getCached(TypesafeDriverExecutionProfile.java:291)
at com.datastax.oss.driver.internal.core.config.typesafe.TypesafeDriverExecutionProfile.getDuration(TypesafeDriverExecutionProfile.java:240)
at com.datastax.oss.driver.api.core.config.DriverExecutionProfile.getDuration(DriverExecutionProfile.java:172)
at com.aws.ssa.keyspaces.retry.AmazonKeyspacesExponentialRetryPolicyTest.testConfig(AmazonKeyspacesExponentialRetryPolicyTest.java:200)
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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
```

Start with exponential-retry-example.conf at line 17 and the testConfig method in AmazonKeyspacesExponentialRetryPolicyTest, then run mvn clean package to reproduce the failure. Done means the retry configuration uses a time unit accepted by Typesafe Config and the test suite completes without this error.

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