deps: update dependency com.puppycrawl.tools:checkstyle to v10.21.2#972

gcf-merge-on-green[bot] merged 1 commit intogoogleapis:maingoogleapis/java-shared-config:mainfrom

renovate-bot:renovate/com.puppycrawl.tools-checkstyle-10.xrenovate-bot/java-shared-config:renovate/com.puppycrawl.tools-checkstyle-10.xCopy head branch name to clipboard