Update rubocop-rspec requirement from ~> 2.30.0 to ~> 3.0.1 (#125)

* Update rubocop-rspec requirement from ~> 2.30.0 to ~> 3.0.1

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@v2.30.0...v3.0.1)

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

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

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kamil K. Lemański <kamil.lemanski@toptal.com>

granite.gemspec

@@ -32,7 +32,8 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rspec-rails', '~> 6.0'
   s.add_development_dependency 'rubocop', '~> 1.64.1'
   s.add_development_dependency 'rubocop-rails', '~> 2.25.0'
-  s.add_development_dependency 'rubocop-rspec', '~> 2.30.0'
+  s.add_development_dependency 'rubocop-rspec', '~> 3.0.1'
+  s.add_development_dependency 'rubocop-rspec_rails', '~> 2.30'
   s.add_development_dependency 'simplecov', '~> 0.15'
 
   s.metadata['rubygems_mfa_required'] = 'true'