Bump mocha from 2.0.2 to 2.1.0 in /gemfiles/rails_61 (#853)

Bumps [mocha](https://github.com/freerange/mocha) from 2.0.2 to 2.1.0.
- [Changelog](https://github.com/freerange/mocha/blob/main/RELEASE.md)
- [Commits](freerange/mocha@v2.0.2...v2.1.0)

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

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

gemfiles/rails_61/Gemfile.lock

@@ -101,7 +101,7 @@ GEM
       builder
       minitest (>= 5.0)
       ruby-progressbar
-    mocha (2.0.2)
+    mocha (2.1.0)
       ruby2_keywords (>= 0.0.5)
     net-imap (0.3.4)
       date