build: bump minitest from 5.12.0 to 5.12.2 in /Library/Homebrew

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.0 to 5.12.2.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/commits

)

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

Library/Homebrew/Gemfile.lock

@@ -40,7 +40,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0904)
     mini_portile2 (2.4.0)
-    minitest (5.12.0)
+    minitest (5.12.2)
     mustache (1.1.0)
     net-http-digest_auth (1.4.1)
     net-http-persistent (3.1.0)