build: bump minitest from 5.12.2 to 5.13.0 in /Library/Homebrew

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.2 to 5.13.0.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/compare/v5.12.2...v5.13.0

)

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

Library/Homebrew/Gemfile.lock

@@ -39,7 +39,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.1009)
     mini_portile2 (2.4.0)
-    minitest (5.12.2)
+    minitest (5.13.0)
     mustache (1.1.0)
     net-http-digest_auth (1.4.1)
     net-http-persistent (3.1.0)