build(deps): bump the bundler group with 1 update

Bumps the bundler group with 1 update: [minitest](https://github.com/minitest/minitest).


Updates `minitest` from 5.21.1 to 5.21.2
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.21.1...v5.21.2)

---
updated-dependencies:
- dependency-name: minitest
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: bundler
...

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

Gemfile.lock

@@ -52,7 +52,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     lumberjack (1.2.10)
     method_source (1.0.0)
-    minitest (5.21.1)
+    minitest (5.21.2)
     multi_xml (0.6.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)