checkstyle-10.9.0

Checkstyle 10.9.0 - https://checkstyle.org/releasenotes.html#Release_10.9.0

New:

#9994 - LITERAL_SWITCH token support in RightCurlyCheck

Other Changes:

Give better names to release actions and files
Use Shellcheck to resolve violations code in Shell Script
Expand XPath IT Regression Testing
emphasize mutability of collectors
Add conditional to run on:push workflows only in checkstyle repository
Make grep always return exit code 0 in set-milestone
Specify violation messages in input files
update doc for SuppressWarnings
Update doc for JavadocMethod