build(deps-dev): bump mocha from 6.2.1 to 6.2.2

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.1 to 6.2.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.1...v6.2.2)

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

Author: dependabot-preview[bot]

yarn.lock

@@ -649,8 +649,8 @@ mkdirp@0.5.1, mkdirp@^0.5.1:
     minimist "0.0.8"
 
 mocha@^6.0.0:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-6.2.1.tgz#da941c99437da9bac412097859ff99543969f94c"
+  version "6.2.2"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-6.2.2.tgz#5d8987e28940caf8957a7d7664b910dc5b2fea20"
   dependencies:
     ansi-colors "3.2.3"
     browser-stdout "1.3.1"