Update RBI files for tzinfo.

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

Library/Homebrew/sorbet/rbi/gems/tzinfo@2.0.6.rbi

@@ -579,6 +579,12 @@ end
 
 class TZInfo::PeriodNotFound < ::StandardError; end
 
+module TZInfo::RubyCoreSupport
+  class << self
+    def untaint(o); end
+  end
+end
+
 class TZInfo::StringDeduper
   def initialize; end