Bump rubocop from 0.63.1 to 0.64.0 in /Library/Homebrew/vendor

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.63.1 to 0.64.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.63.1...v0.64.0)

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

Library/Homebrew/vendor/Gemfile.lock

@@ -43,7 +43,7 @@ GEM
     plist (3.5.0)
     powerpack (0.1.2)
     rainbow (3.0.0)
-    rubocop (0.63.1)
+    rubocop (0.64.0)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
       parser (>= 2.5, != 2.5.1.1)