Update rubocop requirement from ~> 1.49.0 to ~> 1.50.0 (#93)

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@v1.49.0...v1.50.0)

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

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

Gemfile

@@ -12,7 +12,7 @@ group :development, :test do
   gem "rspec", "~> 3.12.0"
   gem "rspec-its", "~> 1.3.0"
   gem "rspec_junit_formatter", "~> 0.6.0"
-  gem "rubocop", "~> 1.49.0"
+  gem "rubocop", "~> 1.50.0"
   gem "rubocop-rake", "~> 0.6.0"
   gem "simplecov", "~> 0.22.0"
   gem "webmock", "~> 3.18.1"