Update chefstyle requirement from 1.7.2 to 1.7.4

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/master/CHANGELOG.md)
- [Commits](chef/chefstyle@v1.7.2...v1.7.4)

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

Gemfile

@@ -13,5 +13,5 @@ group :debug do
 end
 
 group :chefstyle do
-  gem "chefstyle", "1.7.2"
+  gem "chefstyle", "1.7.4"
 end