some formatting

ci-tools/update-nixpkgs

@@ -65,6 +65,7 @@ git push --force origin "${TARGET_BRANCH}:${TARGET_BRANCH}"
 
 BODY=$(python3 -c '
 import os, sys, json
+print("```")
 print(json.dumps({
     "id": os.environ["CI_PROJECT_ID"],
     "source_branch": os.environ["CI_COMMIT_REF_NAME"],
@@ -73,6 +74,7 @@ print(json.dumps({
     "title": "bump nixpkgs version",
     "description": sys.argv[1],
 }))
+print("```")
 ' "${DIFF}")
 
 echo curl -X POST --data "${BODY}" --header "Content-Type: application/json" --header "PRIVATE-TOKEN: ${UPDATE_NIXPKGS_PRIVATE_TOKEN}" "https://${HOST}/api/v4/projects/${CI_PROJECT_ID}/merge_requests"