Update rubocop requirement from ~> 1.59.0 to ~> 1.60.2 (#115)

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@v1.59.0...v1.60.2)

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

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

cloudflare-rails.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rspec', '~> 3.12.0'
   spec.add_development_dependency 'rspec_junit_formatter', '~> 0.6.0'
   spec.add_development_dependency 'rspec-rails', '~> 6.1.0'
-  spec.add_development_dependency 'rubocop', '~> 1.59.0'
+  spec.add_development_dependency 'rubocop', '~> 1.60.2'
   spec.add_development_dependency 'rubocop-performance', '~> 1.19.1'
   spec.add_development_dependency 'rubocop-rails', '~> 2.22.2'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.25.0'