Error Prone 2.20.0

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: v2.19.1...v2.20.0