build(deps-dev): update minitest requirement from 5.22.2 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@v5.22.2...v5.22.3)

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

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

Gemfile

@@ -23,7 +23,7 @@ group :development do
   gem "rexical", "= 1.0.7"
 
   # tests
-  gem "minitest", "5.22.2"
+  gem "minitest", "5.22.3"
   gem "minitest-parallel_fork", "2.0.0"
   gem "ruby_memcheck", "2.3.0"
   gem "rubyzip", "~> 2.3.2"