Ruby: remove deprecated private class

Author: hmac

ruby/ql/lib/codeql/ruby/frameworks/ActionController.qll

@@ -441,11 +441,6 @@ class ActionControllerSkipForgeryProtectionCall extends CsrfProtectionSetting::R
   override boolean getVerificationSetting() { result = false }
 }
 
-/**
- * DEPRECATED: Use `ActionController::ProtectFromForgeryCall` instead.
- */
-deprecated class ActionControllerProtectFromForgeryCall = ActionController::ProtectFromForgeryCall;
-
 /**
  * A call to `send_file`, which sends the file at the given path to the client.
  */