Update rubocop requirement from ~> 0.88.0 to ~> 0.89.1 in /common

Updates the requirements on [rubocop](https://github.com/rubocop-hq/rubocop) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.88.0...v0.89.1)

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

common/dependabot-common.gemspec

@@ -40,7 +40,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 13"
   spec.add_development_dependency "rspec", "~> 3.8"
   spec.add_development_dependency "rspec-its", "~> 1.2"
-  spec.add_development_dependency "rubocop", "~> 0.88.0"
+  spec.add_development_dependency "rubocop", "~> 0.89.1"
   spec.add_development_dependency "vcr", "6.0.0"
   spec.add_development_dependency "webmock", "~> 3.4"