Create a more sensible MR

ci-tools/update-nixpkgs

@@ -67,8 +67,8 @@ BODY=$(python3 -c '
 import os, sys, json
 print(json.dumps({
     "id": os.environ["CI_PROJECT_ID"],
-    "source_branch": os.environ["CI_COMMIT_REF_NAME"],
-    "target_branch": os.environ["TARGET_BRANCH"],
+    "source_branch": os.environ["TARGET_BRANCH"],
+    "target_branch": "develop",
     "remove_source_branch": True,
     "title": "bump nixpkgs version",
     "description": f"```\n{sys.argv[1]}\n```",