Update chefstyle requirement from 2.0.8 to 2.1.1

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@v2.0.8...v2.1.1)

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

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

Gemfile

@@ -5,7 +5,7 @@ group :test do
   gem "coveralls", require: false
   gem "minitest", "~> 5.8"
   gem "rake", "~> 13.0"
-  gem "chefstyle", "2.0.8"
+  gem "chefstyle", "2.1.1"
   gem "concurrent-ruby", "~> 1.0"
   gem "pry-byebug"
   gem "m"