Merge pull request #11472 from creative-commoners/pulls/5/depr-validate

API Deprecation notice for FormField::validate()

src/Forms/FormField.php

@@ -1242,6 +1242,11 @@ protected function extendValidationResult(bool $result, Validator $validator): b
      */
     public function validate($validator)
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'This method will take zero arguments and return a ValidationResult'
+            . ' object instead of a boolean in CMS 6.0.0'
+        );
         return $this->extendValidationResult(true, $validator);
     }