Bump minitest from 5.19.0 to 5.20.0

Bumps [minitest](https://github.com/minitest/minitest) from 5.19.0 to 5.20.0.
- [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:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -16,7 +16,8 @@ GEM
       method_source (>= 0.6.7)
       rake (>= 0.9.2.2)
     method_source (1.0.0)
-    minitest (5.19.0)
+    minitest (5.20.0)
+    mocktail (0.0.1)
     parallel (1.23.0)
     parser (3.2.2.3)
       ast (~> 2.4.1)
@@ -55,12 +56,12 @@ GEM
 
 PLATFORMS
   arm64-darwin-22
-  ruby
   x86_64-linux
 
 DEPENDENCIES
   m
   minitest
+  mocktail
   rake
   standard
   standard-performance!