Bump cookstyle from 7.15.1 to 7.15.2

Bump cookstyle from 7.15.1 to 7.15.2

Bumps [cookstyle](https://github.com/chef/cookstyle) from 7.15.1 to 7.15.2.
- [Release notes](https://github.com/chef/cookstyle/releases)
- [Changelog](https://github.com/chef/cookstyle/blob/master/CHANGELOG.md)
- [Commits](https://github.com/chef/cookstyle/compare/v7.15.1...v7.15.2)

---
updated-dependencies:
- dependency-name: cookstyle
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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