Update extended.yml

.github/workflows/extended.yml

@@ -26,11 +26,7 @@ concurrency:
 # this job is intended to only run only on the main branch as it is time consuming
 # and very rarely fails. However, it is important coverage to ensure correctness
 # in the (very rare) event of a hash failure.
-on:
-  # Run on all commits to main
-  push:
-    branches:
-      - main
+on: [push]
 
 jobs:
   # Check answers are correct when hash values collide