Bump checkstyle from 8.38 to 8.40

Bumps [checkstyle](https://github.com/checkstyle/checkstyle) from 8.38 to 8.40.
- [Release notes](https://github.com/checkstyle/checkstyle/releases)
- [Commits](https://github.com/checkstyle/checkstyle/compare/checkstyle-8.38...checkstyle-8.40)

Signed-off-by: dependabot[bot] <support@github.com>
2 files changed