Update dependency com.google.errorprone:error_prone_annotations to v2.15.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.errorprone:error_prone_annotations (source)	2.14.0 -> 2.15.0

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Release Notes

google/error-prone

v2.15.0

New Checkers:

• BuilderReturnThis
• CanIgnoreReturnValueSuggester
• CannotMockFinalClass
• CannotMockFinalMethod
• DirectInvocationOnMock
• ExtendsObject
• MockNotUsedInProduction
• NoCanIgnoreReturnValueOnClasses
• NullArgumentForNonNullParameter
• SelfAlwaysReturnsThis
• UnsafeWildcard
• UnusedTypeParameter

Fixed issues: #​1562, #​3236, #​3245, #​3321

Full Changelog: https://github.com/google/error-prone/compare/v2.14.0...v2.15.0

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