Update rubocop-rails requirement from = 2.21.2 to = 2.22.1

Updates the requirements on [rubocop-rails](https://github.com/rubocop/rubocop-rails) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.21.2...v2.22.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

panolint-rails.gemspec

@@ -18,5 +18,5 @@ Gem::Specification.new do |spec|
   end
 
   spec.add_dependency "brakeman", "6.0.1"
-  spec.add_dependency "rubocop-rails", "2.21.2"
+  spec.add_dependency "rubocop-rails", "2.22.1"
 end