Update simplecov requirement from ~> 0.21.2 to ~> 0.22.0

Updates the requirements on [simplecov](https://github.com/simplecov-ruby/simplecov) to permit the latest version.
- [Release notes](https://github.com/simplecov-ruby/simplecov/releases)
- [Changelog](https://github.com/simplecov-ruby/simplecov/blob/main/CHANGELOG.md)
- [Commits](simplecov-ruby/simplecov@v0.21.2...v0.22.0)

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

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

colorls.gemspec

@@ -80,6 +80,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-rake', '~> 0.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.18.1'
   spec.add_development_dependency 'rubygems-tasks', '~> 0'
-  spec.add_development_dependency 'simplecov', '~> 0.21.2'
+  spec.add_development_dependency 'simplecov', '~> 0.22.0'
   spec.metadata['rubygems_mfa_required'] = 'true'
 end