[Security] Bump checkstyle from 8.12 to 8.18
[Security] Bump checkstyle from 8.12 to 8.18

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.12 to 8.18. **This update includes a security fix.**
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.12...checkstyle-8.18)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
badgerwithagun/morf,badgerwithagun/morf