Update comment

Author: SSaishruthi

.github/workflows/main.yml

@@ -11,5 +11,5 @@ jobs:
     - uses: superbrothers/close-pull-request@v3
       with:
         # Optional. Post a issue comment just before closing a pull request.
-        comment: "We do not accept PRs. If you have any questions, please feel free to contact us."
+        comment: "Congratulations! You have completed the lab. Closing for maintainence purpose."