Remove redundant patch for csv_serialization

patches/d9.json

@@ -61,9 +61,6 @@
       "#2816447 RSS feed titles wrong language": "https://www.drupal.org/files/issues/2021-06-24/2816447-45.patch",
       "#2915705 TypedData any": "https://www.drupal.org/files/issues/2021-05-03/2915705-66.patch"
     },
-    "drupal/csv_serialization": {
-      "#3231046 Fix argument casts": "https://git.drupalcode.org/project/csv_serialization/-/merge_requests/3.diff"
-    },
     "drupal/default_content": {
       "#2698425 Do not reimport existing entities": "https://www.drupal.org/files/issues/2018-12-11/default_content-dont-reimport-2698425-109.patch",
       "#2640734 Allow manual imports": "https://www.drupal.org/files/issues/2019-01-28/2640734-93.default_content.Allow-manual-imports.patch"