fix(deps): Update the Java code generator (gapic-generator-java) to 2.31.0

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PiperOrigin-RevId: 596645164

Source-Link: googleapis/googleapis@4a0e62e

Source-Link: https://github.com/googleapis/googleapis-gen/commit/a10ed6a77676c37e60799098d48d0afb16008613
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYTEwZWQ2YTc3Njc2YzM3ZTYwNzk5MDk4ZDQ4ZDBhZmIxNjAwODYxMyJ9

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Owl bot is regenerating pull request 1502...
Build name: NDc2ZTFkYjktNmMwMi00ZTcwLTgyYjMtNjIzYzFmMzU0YjJk

[alicejli]

Kokoro integration test failure:

[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 485.7 s <<< FAILURE! -- in com.google.cloud.logging.it.ITTailLogsTest
[ERROR] com.google.cloud.logging.it.ITTailLogsTest.testTailLogEntries -- Time elapsed: 120.0 s <<< ERROR!
org.junit.runners.model.TestTimedOutException: test timed out after 120000 milliseconds
	at sun.misc.Unsafe.park(Native Method)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
	at java.util.concurrent.ArrayBlockingQueue.take(ArrayBlockingQueue.java:403)
	at com.google.api.gax.rpc.QueuingResponseObserver.getNext(QueuingResponseObserver.java:70)
	at com.google.api.gax.rpc.ServerStreamIterator.hasNext(ServerStreamIterator.java:96)
	at com.google.cloud.logging.LogEntryIterator.hasNext(LogEntryIterator.java:42)
	at com.google.cloud.logging.it.ITTailLogsTest.testTailLogEntries(ITTailLogsTest.java:69)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:750)

[INFO] Running com.google.cloud.logging.it.ITLoggingTest
ERROR: Failed to delete a _Required sink, error: com.google.cloud.logging.LoggingException: io.grpc.StatusRuntimeException: PERMISSION_DENIED: Sink _Required cannot be deleted
ERROR: Failed to delete a _Default sink, error: com.google.cloud.logging.LoggingException: io.grpc.StatusRuntimeException: PERMISSION_DENIED: Sink _Default cannot be deleted. Consider disabling instead