Bumps [cookstyle](https://github.com/chef/cookstyle) from 6.20.2 to 6.21.1.
- [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/v6.20.2...v6.21.1)
Signed-off-by: dependabot[bot] <support@github.com>
bcrypt_pbkdf (1.0.1)
builder (3.2.4)
chef-utils (16.5.77)
- cookstyle (6.20.2)
+ cookstyle (6.21.1)
rubocop (= 0.93.1)
diff-lcs (1.4.4)
docker-api (2.0.0)