build(deps-dev): update rubocop requirement from 1.50.2 to 1.51.0

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@v1.50.2...v1.51.0)

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

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

Gemfile

@@ -28,7 +28,7 @@ group :development do
 
   # rubocop
   if Gem::Requirement.new("~> 3.0").satisfied_by?(Gem::Version.new(RUBY_VERSION))
-    gem "rubocop", "1.50.2"
+    gem "rubocop", "1.51.0"
     gem "rubocop-minitest", "0.31.0"
     gem "rubocop-packaging", "0.5.2"
     gem "rubocop-performance", "1.17.1"