Bump minitest from 5.20.0 to 5.21.1

Bumps [minitest](https://github.com/minitest/minitest) from 5.20.0 to 5.21.1.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.20.0...v5.21.1)

---
updated-dependencies:
- dependency-name: minitest
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -160,7 +160,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2022.0105)
     mini_mime (1.1.5)
-    minitest (5.20.0)
+    minitest (5.21.1)
     msgpack (1.6.0)
     multi_json (1.15.0)
     multi_xml (0.6.0)

gem/imazen_licensing.gemspec

@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "bundler", "~> 2"
   spec.add_development_dependency "rake", "> 10.4.0"
-  spec.add_development_dependency "minitest", "~> 5.8.4"
+  spec.add_development_dependency "minitest", "~> 5.21.1"
   spec.add_development_dependency "dotenv", "~> 2"
 end