Build(deps-dev): Update mocha requirement from >= 1.4.0, < 3 to >= 1.4.0, < 4

Updates the requirements on [mocha](https://github.com/freerange/mocha) to permit the latest version.
- [Changelog](https://github.com/freerange/mocha/blob/main/RELEASE.md)
- [Commits](freerange/mocha@v1.4.0...v3.1.0)

---
updated-dependencies:
- dependency-name: mocha
  dependency-version: 3.1.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

Gemfile

@@ -31,7 +31,7 @@ gem "paint", "~> 2.2"
 
 group(:test) do
   gem "beaker-hostgenerator"
-  gem "mocha", '>= 1.4.0', '< 3'
+  gem "mocha", '>= 1.4.0', '< 4'
   gem "rack-test", '>= 1', '< 3'
   gem 'rspec-github', require: false
 end