Update rubocop-performance requirement from ~> 1.19.0 to >= 1.19, < 1.22

Updates the requirements on [rubocop-performance](https://github.com/rubocop/rubocop-performance) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-performance/releases)
- [Changelog](https://github.com/rubocop/rubocop-performance/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-performance@v1.19.0...v1.21.1)

---
updated-dependencies:
- dependency-name: rubocop-performance
  dependency-type: direct:production
...

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

theforeman-rubocop.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'rubocop-checkstyle_formatter', '~> 0.6.0'
   spec.add_dependency 'rubocop-graphql', '~> 1.4.0'
   spec.add_dependency 'rubocop-minitest', '~> 0.33.0'
-  spec.add_dependency 'rubocop-performance', '~> 1.19.0'
+  spec.add_dependency 'rubocop-performance', '>= 1.19', '< 1.22'
   spec.add_dependency 'rubocop-rails', '~> 2.22.0'
   spec.add_dependency 'rubocop-rspec', '~> 2.25.0'
   spec.add_development_dependency 'bundler', '~> 2.4', '>= 2.4.22'