Bump mocha from 2.4.5 to 2.5.0

Bumps [mocha](https://github.com/freerange/mocha) from 2.4.5 to 2.5.0.
- [Changelog](https://github.com/freerange/mocha/blob/main/RELEASE.md)
- [Commits](freerange/mocha@v2.4.5...v2.5.0)

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

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

Gemfile.lock

@@ -148,7 +148,7 @@ GEM
     metrics (0.10.2)
     mini_mime (1.1.5)
     minitest (5.25.1)
-    mocha (2.4.5)
+    mocha (2.5.0)
       ruby2_keywords (>= 0.0.5)
     multi_json (1.15.0)
     multi_xml (0.7.1)