Bump mocha from 2.6.0 to 2.6.1

Bumps [mocha](https://github.com/freerange/mocha) from 2.6.0 to 2.6.1.
- [Changelog](https://github.com/freerange/mocha/blob/main/RELEASE.md)
- [Commits](freerange/mocha@v2.6.0...v2.6.1)

---
updated-dependencies:
- dependency-name: mocha
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -49,7 +49,7 @@ GEM
     language_server-protocol (3.17.0.3)
     method_source (1.1.0)
     minitest (5.24.0)
-    mocha (2.6.0)
+    mocha (2.6.1)
       ruby2_keywords (>= 0.0.5)
     mono_logger (1.1.2)
     multi_json (1.15.0)