[7.2.0] Update @rules_java v7.6.1

[Wyverald]

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[Wyverald]

@hvadehra there's a crapton of these failures on CI:

com.google.devtools.build.lib.skyframe.BzlLoadFunction$BzlLoadFunctionException: com.google.devtools.build.lib.skyframe.BzlLoadFunction$BzlLoadFailedException: Label '@@rules_java~//java/common:java_common.bzl' is invalid because 'java/common' is not a package; perhaps you meant to put the colon here: '@@rules_java~//java:common/java_common.bzl'?
	at com.google.devtools.build.lib.skyframe.BzlLoadFunction.compute(BzlLoadFunction.java:199)
	at com.google.devtools.build.skyframe.AbstractParallelEvaluator$Evaluate.run(AbstractParallelEvaluator.java:461)
	at com.google.devtools.build.lib.concurrent.AbstractQueueVisitor$WrappedRunnable.run(AbstractQueueVisitor.java:414)
	at java.base/java.util.concurrent.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1403)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:387)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1312)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1843)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1808)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:188)
Caused by: com.google.devtools.build.lib.skyframe.BzlLoadFunction$BzlLoadFailedException: Label '@@rules_java~//java/common:java_common.bzl' is invalid because 'java/common' is not a package; perhaps you meant to put the colon here: '@@rules_java~//java:common/java_common.bzl'?
	at com.google.devtools.build.lib.skyframe.BzlLoadFunction$BzlLoadFailedException.labelCrossesPackageBoundary(BzlLoadFunction.java:1660)
	at com.google.devtools.build.lib.skyframe.BzlLoadFunction.validatePackageAndGetCompileKey(BzlLoadFunction.java:691)
	at com.google.devtools.build.lib.skyframe.BzlLoadFunction.computeInternal(BzlLoadFunction.java:545)
	at com.google.devtools.build.lib.skyframe.BzlLoadFunction.compute(BzlLoadFunction.java:197)
	... 8 more

Did I miss something during the cherry-pick? The PR was fine on master.

[hvadehra]

I think it's just the unit tests setup. Likely we just need 999762d and just the test setup bits from 20c49b4