Update spotbugs.version to v4.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.github.spotbugs:spotbugs (source)	4.9.0 -> 4.9.1
com.github.spotbugs:spotbugs-annotations (source)	4.9.0 -> 4.9.1

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Release Notes

spotbugs/spotbugs (com.github.spotbugs:spotbugs)

v4.9.1

Compare Source

Added

• New detector SharedVariableAtomicityDetector for new bug types AT_NONATOMIC_OPERATIONS_ON_SHARED_VARIABLE, AT_NONATOMIC_64BIT_PRIMITIVE and AT_STALE_THREAD_WRITE_OF_PRIMITIVE (See SEI CERT rules VNA00-J, VNA02-J and VNA05-J).
• New detector FindHiddenMethod for bug type HSM_HIDING_METHOD. This bug is reported whenever a subclass method hides the static method of super class. (See SEI CERT MET07-J).

Fixed

• Fixed the parsing of generics methods in ThrowingExceptions (#​3267)
• Accept the 1st parameter of java.util.concurrent.CompletableFuture's completeOnTimeout(), getNow() and obtrudeValue() functions as nullable (#​1001).
• Fixed the analysis error when FindReturnRef was checking instructions corresponding to a CFG branch that was optimized away (#​3266)
• Added execute file permission to files in the distribution archive (#​3274)
• Fixed a stack overflow in MultipleInstantiationsOfSingletons when a singleton initializer makes recursive calls (#​3280)
• Fixed NPE in FindReturnRef on inner class fields (#​3283)
• Fixed NP_NULL_ON_SOME_PATH_FROM_RETURN_VALUE false positive when add edu.umd.cs.findbugs.annotations.Nullable (#​3243)

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