build(deps-dev): bump mocha from 6.1.1 to 6.1.2

Bumps [mocha](https://github.com/mochajs/mocha) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.1.1...v6.1.2)

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

Author: dependabot-support

yarn.lock

@@ -677,8 +677,8 @@ mkdirp@0.5.1, mkdirp@^0.5.1:
     minimist "0.0.8"
 
 mocha@^6.0.0:
-  version "6.1.1"
-  resolved "https://registry.yarnpkg.com/mocha/-/mocha-6.1.1.tgz#b4f81a9b673649ef72098cb56bfddbfd39da5127"
+  version "6.1.2"
+  resolved "https://registry.yarnpkg.com/mocha/-/mocha-6.1.2.tgz#31e960580ef709ef5f26bbe760547cf5207b44df"
   dependencies:
     ansi-colors "3.2.3"
     browser-stdout "1.3.1"