dev-cmd/typecheck: Reinstate srb rbi hidden-definitions

- Turns out we do need this. I lulled us into a false sense of security
  by not deleting `sorbet/rbi/hidden-defintions/hidden.rbi` previously.
- If we do delete that file then Sorbet reveals >200 typechecking
  issues.
- The docs on moving from `srb rbi` to `tapioca` say that we don't need
  `hidden-definitions` anymore, but clearly we do. The blog post goes
  into a lot of detail on why `rbi hidden-defintions` exists and the
  fact that there's not an analogous command in Tapioca:
  https://sorbet.org/blog/2022/07/27/srb-tapioca#whats-happening-with-srb-rbi-hidden-definitions
- Eventually we should try out `tapioca dsl`, since that's said to be a
  "partial replacement" for `hidden-definitions`, and removing our
  reliance on deprecated commands can only be a good thing?

Library/Homebrew/dev-cmd/typecheck.rb

@@ -67,6 +67,7 @@ module Homebrew
         ohai "Updating Tapioca RBI files..."
         safe_system "bundle", "exec", "tapioca", "gem", *tapioca_args
         safe_system "bundle", "exec", "parlour"
+        safe_system "bundle", "exec", "srb", "rbi", "hidden-definitions"
         safe_system "bundle", "exec", "tapioca", "todo"
 
         if args.suggest_typed?