Update dependency checkstyle to v12.1.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
checkstyle (source)	12.1.0 -> 12.1.1

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Release Notes

checkstyle/checkstyle (checkstyle)

v12.1.1

Checkstyle 12.1.1 - https://checkstyle.org/releasenotes.html#Release_12.1.1

Bug fixes:

#​17975 - Incorrect encoding in non-English properties files causing garbled characters in localized messages
#​17681 - Google style config and formatter differ on blank line separation
#​3110 - some messages are still hardcoded in english

Other Changes:

Update `JavadocCommentsTokenTypes.java` to new format of AST print
Add `rewrite` support for `errorprone.refasterrules`
avoid horizontal scrolling in atclauseorder.html
Wrong tagOrder in AtClauseOrder documentation.
Resolve error-prone violations
Enforce file size on Java inputs
Cover pitest survivals with tests
Define violation messages for all violations
SLF4J configuration warnings when running tests
JVM warnings when running tests

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