Update RBI files for minitest.

Autogenerated by the [vendor-gems](https://github.com/Homebrew/brew/blob/HEAD/.github/workflows/vendor-gems.yml) workflow.

Library/Homebrew/sorbet/rbi/gems/minitest@5.19.0.rbi

@@ -214,6 +214,9 @@ class Minitest::Runnable
   def failures=(_arg0); end
   def marshal_dump; end
   def marshal_load(ary); end
+  def metadata; end
+  def metadata=(_arg0); end
+  def metadata?; end
   def name; end
   def name=(o); end
   def passed?; end

Library/Homebrew/sorbet/rbi/hidden-definitions/hidden.rbi

@@ -5051,8 +5051,6 @@ class Migrator
   extend ::T::Private::Methods::SingletonMethodHooks
 end
 
-MiniTest = Minitest
-
 module Minitest::Assertions
   def assert_mock(mock); end
 end