Bump minitest from 5.21.2 to 5.22.0

Bumps [minitest](https://github.com/minitest/minitest) from 5.21.2 to 5.22.0.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.21.2...v5.22.0)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -15,7 +15,7 @@ GEM
     hiredis (0.6.3-java)
     json (2.7.1)
     json (2.7.1-java)
-    minitest (5.21.2)
+    minitest (5.22.0)
     parallel (1.24.0)
     parser (3.3.0.5)
       ast (~> 2.4.1)