`Migrate to Java 21`

### New feature, improvement proposal

## `Migrate to Java 21`

apply changes commonly needed when migrating to Java `21`.

- https://github.com/pmd/pmd/issues/5713
- https://github.com/apache/maven-pmd-plugin/pull/201

https://docs.openrewrite.org/recipes/java/migrate/upgradetojava21

> Java 21 brings significant improvements, including enhanced performance, security updates, and new language features like record patterns and string templates.

- https://github.com/checkstyle/checkstyle/issues/16981
- https://github.com/checkstyle/checkstyle/issues/16981#issuecomment-2841063249

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`Migrate to Java 21` #200

New feature, improvement proposal