Bump minitest from 5.25.2 to 5.25.4 in /steep

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: indirect
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

steep/Gemfile.lock

@@ -32,7 +32,7 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.6.2)
-    minitest (5.25.2)
+    minitest (5.25.4)
     parser (3.3.6.0)
       ast (~> 2.4.1)
       racc