build(deps-dev): bump minitest from 5.25.2 to 5.25.4

Bumps [minitest](https://github.com/minitest/minitest) from 5.25.2 to 5.25.4.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.25.2...v5.25.4)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -53,7 +53,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
     mini_portile2 (2.8.8)
-    minitest (5.25.2)
+    minitest (5.25.4)
     mocha (2.7.0)
       ruby2_keywords (>= 0.0.5)
     mutex_m (0.2.0)