Update rubocop-rspec requirement from ~> 3.6.0 to ~> 3.7.0 (#216)

Updates the requirements on [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) to permit the latest version.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rspec@v3.6.0...v3.7.0)

---
updated-dependencies:
- dependency-name: rubocop-rspec
  dependency-version: 3.7.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

cloudflare-rails.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 1.81.1'
   spec.add_development_dependency 'rubocop-performance', '~> 1.26.0'
   spec.add_development_dependency 'rubocop-rails', '~> 2.33.4'
-  spec.add_development_dependency 'rubocop-rspec', '~> 3.6.0'
+  spec.add_development_dependency 'rubocop-rspec', '~> 3.7.0'
   spec.add_development_dependency 'webmock', '~> 3.25.0'
   spec.add_dependency 'actionpack', '>= 7.1.0', '< 8.2.0'
   spec.add_dependency 'activesupport', '>= 7.1.0', '< 8.2.0'