Update simplecov requirement from ~> 0.21.0 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@v0.21.0...v0.22.0)

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

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

Gemfile

@@ -10,6 +10,6 @@ group :developmend do
   gem 'rake'
   gem 'rspec', '~> 3.12.0'
   gem 'rubocop', '~> 1.40.0'
-  gem 'simplecov', '~> 0.21.0'
+  gem 'simplecov', '~> 0.22.0'
   gem 'simplecov-cobertura', '~> 2.1.0'
 end