Update chefstyle requirement from 2.0.9 to 2.1.0 (#1805)

Updates the requirements on [chefstyle](https://github.com/chef/chefstyle) to permit the latest version.
- [Release notes](https://github.com/chef/chefstyle/releases)
- [Changelog](https://github.com/chef/chefstyle/blob/main/CHANGELOG.md)
- [Commits](chef/chefstyle@v2.0.9...v2.1.0)

---
updated-dependencies:
- dependency-name: chefstyle
  dependency-type: direct:development
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dan Webb <dan.webb@damacus.io>

Gemfile

@@ -17,5 +17,5 @@ group :debug do
 end
 
 group :chefstyle do
-  gem "chefstyle", "2.0.9"
+  gem "chefstyle", "2.1.0"
 end