Bump minitest from 5.18.1 to 5.20.0

Bumps [minitest](https://github.com/minitest/minitest) from 5.18.1 to 5.20.0.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/minitest/minitest/compare/v5.18.1...v5.20.0)

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

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

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 gemspec
 
-gem 'minitest', '~> 5.18'
+gem 'minitest', '~> 5.20'
 gem 'minitest-ci', '~> 3.4'
 gem 'minitest-reporters', '~> 1.3'
 gem 'rake', '~> 13.0'

Gemfile.lock

@@ -11,7 +11,7 @@ GEM
     builder (3.2.4)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
-    minitest (5.18.1)
+    minitest (5.20.0)
     minitest-ci (3.4.0)
       minitest (>= 5.0.6)
     minitest-reporters (1.6.0)
@@ -61,7 +61,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  minitest (~> 5.18)
+  minitest (~> 5.20)
   minitest-ci (~> 3.4)
   minitest-reporters (~> 1.3)
   rake (~> 13.0)