Update simplecov requirement from ~> 0.17.1 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@v0.17.1...v0.22.0)

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

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

Gemfile

@@ -6,7 +6,7 @@ group :extra do
 end
 
 group :development do
-  gem 'simplecov', '~> 0.17.1'
+  gem 'simplecov', '~> 0.22.0'
   gem 'ruby-prof', :platforms => :ruby
 end