Bump minitest from 5.22.2 to 5.23.0

Bumps [minitest](https://github.com/minitest/minitest) from 5.22.2 to 5.23.0.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.22.2...v5.23.0)

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

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

Gemfile.lock

@@ -180,7 +180,7 @@ GEM
     method_source (1.0.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
-    minitest (5.22.2)
+    minitest (5.23.0)
     minitest-reporters (1.6.1)
       ansi
       builder