Bump minitest from 5.24.1 to 5.25.1 (#740)

Bumps [minitest](https://github.com/minitest/minitest) from 5.24.1 to 5.25.1.
- [Changelog](https://github.com/minitest/minitest/blob/master/History.rdoc)
- [Commits](minitest/minitest@v5.24.1...v5.25.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kevin Dangoor <[email protected]>

Gemfile.lock

@@ -48,7 +48,7 @@ GEM
       rugged (>= 0.24, < 2.0)
       thor (>= 0.19, < 2.0)
     mini_portile2 (2.8.1)
-    minitest (5.24.1)
+    minitest (5.25.1)
     minitest-hooks (1.5.2)
       minitest (> 5.3)
     mocha (2.4.5)