[chore] trigger changelog CI check on PR title edit (#12737)

The changelog CI check is modified to be re-triggered when the PR title
is edited. The changelog CI relies on PR title, so I think it makes
sense to rerun it when one edits PR title (eg to include "chore", that
can make the CI pass)

Author: cijothomas

.github/workflows/changelog.yml

@@ -6,7 +6,7 @@ name: changelog
 
 on:
   pull_request:
-    types: [opened, ready_for_review, synchronize, reopened, labeled, unlabeled]
+    types: [opened, ready_for_review, synchronize, reopened, labeled, unlabeled, edited]
     branches:
       - main
   merge_group: