Update all non-major dependencies to v2.20.0

This MR contains the following updates:

Package	Type	Update	Change
com.google.errorprone:error_prone_core (source)		minor	2.19.1 -> 2.20.0
com.google.errorprone:error_prone_annotations (source)	compile	minor	2.19.1 -> 2.20.0

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Release Notes

google/error-prone

v2.20.0: Error Prone 2.20.0

Compare Source

Changes:

• This release is compatible with early-access builds of JDK 21.

New Checkers:

• InlineTrivialConstant
• UnnecessaryStringBuilder
• BanClassLoader
• DereferenceWithNullBranch
• DoNotUseRuleChain
• LockOnNonEnclosingClassLiteral
• MissingRefasterAnnotation
• NamedLikeContextualKeyword
• NonApiType

Fixes issues: #​2232, #​2243, #​2997, #​3301, #​3843, #​3903, #​3918, #​3923, #​3931, #​3945, #​3946

Full Changelog: https://github.com/google/error-prone/compare/v2.19.1...v2.20.0

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