Update error-prone.version to v2.31.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.errorprone:error_prone_core (source)	2.30.0 -> 2.31.0
com.google.errorprone:error_prone_annotations (source)	2.30.0 -> 2.31.0

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Release Notes

google/error-prone (com.google.errorprone:error_prone_core)

v2.31.0: Error Prone 2.31.0

This is the last planned minor release of Error Prone that will support running on JDK 11, see #​3803. Using Error Prone to compile code that is deployed to earlier versions will continue to be fully supported, but will require using JDK 17 or newer for compilation and setting --release or -source/-target/-bootclasspath.

Changes:

• Introduce @ThreadSafeTypeParameter with enforcement by ThreadSafe
• Improved support for latest JDK 24 EA builds
• Error Prone is now distributed as a Multi-Release jar (#​3756)

New checks:

• AutoValueBoxedValues: AutoValue instances should not usually contain boxed types that are not Nullable. We recommend removing the unnecessary boxing.

Full changelog: google/error-prone@v2.30.0...v2.31.0

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