Update minitest requirement from ~> 5.8.4 to ~> 5.22.3

Updates the requirements on [minitest](https://github.com/minitest/minitest) to permit the latest version.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.8.4...v5.22.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

rspec_api_documentation.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "nokogiri", "~> 1.8.4"
   s.add_development_dependency "yard", "~> 0.9.15"
   s.add_development_dependency "inch", "~> 0.8.0"
-  s.add_development_dependency "minitest", "~> 5.8.4"
+  s.add_development_dependency "minitest", "~> 5.22.3"
   s.add_development_dependency "contracts", "~> 0.17"
   s.add_development_dependency "gherkin", "~> 9.0.0"
   s.add_development_dependency "multi_json", "~> 1.15.0"