Use the proper DSL for deprecated lines

Co-authored-by: Mike McQuaid <[email protected]>

Author: vraravam

Library/Homebrew/cask/artifact/abstract_uninstall.rb

@@ -20,7 +20,8 @@ class AbstractUninstall < AbstractArtifact
         :launchctl,
         :quit,
         :signal,
-        :login_item, # DEPRECATED: Need to remove once the casks have been fixed
+        # odeprecated: deprecate when all casks have been migrated to login_items
+        :login_item,
         :kext,
         :script,
         :pkgutil,