Bump checkstyle from 8.20 to 8.21

[dependabot-preview]

Bumps checkstyle from 8.20 to 8.21.

Release notes

Sourced from checkstyle's releases.

checkstyle-8.21

https://checkstyle.org/releasenotes.html#Release_8.21

Commits

• 344fbac [maven-release-plugin] prepare release checkstyle-8.21
• 82a1033 doc: add release notes for 8.21
• 68a0922 Issue #5832: Add javadoc and xdoc Example for PackageName
• f0b16de Issue #5832: Add javadoc and xdoc Example for MethodTypeParameterName
• 52ef591 Issue #6749: aligned javadoc/xdoc for EmptyLineSeparatorCheck
• 640689b spelling: identificator->identifier
• 86c1acb spelling: inpection
• b2cf16e Issue #6489: correct one-char loop variable in LocalVariableNameCheck
• b458b3d Issue #6749: aligned javadoc/xdoc for OperatorWrap
• 87b5cbe Issue #6749: aligned javadoc/xdoc for NoWhitespaceAfter
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Automerge options (never/patch/minor, and dev/runtime dependencies)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

---