Build(deps-dev): Bump mocha from 2.6.1 to 2.7.1

Bumps [mocha](https://github.com/freerange/mocha) from 2.6.1 to 2.7.1.
- [Changelog](https://github.com/freerange/mocha/blob/main/RELEASE.md)
- [Commits](https://github.com/freerange/mocha/compare/v2.6.1...v2.7.1)

---
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

@@ -254,7 +254,7 @@ GEM
       ffi (~> 1.9)
     minio_runner (0.1.2)
     minitest (5.25.4)
-    mocha (2.6.1)
+    mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
     msgpack (1.7.5)
     multi_json (1.15.0)