Upgrade: Update minitest requirement from ~> 5.19.0 to ~> 5.20.0

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@v5.19.0...v5.20.0)

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

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

Gemfile.lock

@@ -17,7 +17,7 @@ GEM
     json (2.6.3)
     language_server-protocol (3.17.0.3)
     mini_portile2 (2.8.4)
-    minitest (5.19.0)
+    minitest (5.20.0)
     nokogiri (1.15.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
@@ -61,7 +61,7 @@ PLATFORMS
 DEPENDENCIES
   apt-spy2!
   bundler (~> 2.0)
-  minitest (~> 5.19.0)
+  minitest (~> 5.20.0)
   rake
   rubocop
   simplecov (~> 0.18)

apt-spy2.gemspec

@@ -28,7 +28,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'thor', '>= 0.18.1'
 
   spec.add_development_dependency 'bundler', '~> 2.0'
-  spec.add_development_dependency 'minitest', '~> 5.19.0'
+  spec.add_development_dependency 'minitest', '~> 5.20.0'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'simplecov', '~> 0.18'