Bump the rubocop-dependencies group with 1 update (#119)

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.55.1...v1.56.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  dependency-group: rubocop-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -10,7 +10,7 @@ group :development, :test do
 end
 
 group :development do
-  gem 'rubocop', '~> 1.55.1', require: false
+  gem 'rubocop', '~> 1.56.0', require: false
   gem 'rubocop-rake', '~> 0.6.0', require: false
   # rubocop-rspec: Intentional ignored
 end