sorbet: Update RBI files.

Autogenerated by the [sorbet](https://github.com/Homebrew/brew/blob/master/.github/workflows/sorbet.yml) workflow.

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

@@ -12662,6 +12662,7 @@ class Object
   DEPRECATED_OFFICIAL_TAPS = ::T.let(nil, ::T.untyped)
   ENV = ::T.let(nil, ::T.untyped)
   FORMULA_COMPONENT_PRECEDENCE_LIST = ::T.let(nil, ::T.untyped)
+  HIDDEN_DESC_PLACEHOLDER = ::T.let(nil, ::T.untyped)
   HOMEBREW_BOTTLES_EXTNAME_REGEX = ::T.let(nil, ::T.untyped)
   HOMEBREW_BOTTLE_DEFAULT_DOMAIN = ::T.let(nil, ::T.untyped)
   HOMEBREW_BREW_DEFAULT_GIT_REMOTE = ::T.let(nil, ::T.untyped)