Update rubocop requirement from = 1.65.1 to = 1.66.1

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@v1.65.1...v1.66.1)

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

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

faraday_middleware-aws-sigv4.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec', '~> 3.0'
-  spec.add_development_dependency 'rubocop', '1.65.1'
+  spec.add_development_dependency 'rubocop', '1.66.1'
   spec.add_development_dependency 'rubocop-rake', '0.6.0'
   spec.add_development_dependency 'rubocop-rspec', '3.0.5'
   spec.add_development_dependency 'timecop'