Checkstyle 8.30

Checkstyle 8.30 - https://checkstyle.org/releasenotes.html#Release_8.30

New:
New check: AvoidDoubleBraceInitialization
Bug fixes:
False-positive RightCurly in google_checks since 8.20
GenericWhitespace complains about normal spacing with generic constructor
NewlineAtEndOfFile=lf does not create error when file uses crlf
Notes:
Update doc for StringLiteralEquality
Update doc for MissingSwitchDefault
Update doc for WhitespaceAfter
doc: fix indentation of config example
doc: add example of non-instance member for MemberNameCheck
Code samples for Naming Checks
doc: deprecated -> Deprecated
Add warning message at style coverage pages that referenced config is not released
Change line number comparisons to use common isOnSameLine method
Xpath implementation: relationship between getLocalPart and getStringValue
Put in doc reason why ENUM_CONSTANT_DEF and LAMBDA tokens are not supported in RightCurlyCheck
doc: fix typo training -> trailing
Mark DetailAST::getNumberOfChildren as deprecated
PMD warnings about duplicate rules
automation of github actions for release.sh
update release.sh with minor improvments