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](freerange/mocha@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] <[email protected]>

Gemfile.lock

@@ -105,7 +105,7 @@ GEM
       nokogiri (>= 1.12.0)
     mini_mime (1.1.5)
     minitest (5.25.4)
-    mocha (2.6.1)
+    mocha (2.7.1)
       ruby2_keywords (>= 0.0.5)
     nio4r (2.7.4)
     nokogiri (1.16.8-aarch64-linux)