Add edited and synchronize triggers to enable comment cleanup on PR changes

Author: spbolton

.github/workflows/issue_open-pr.yml

@@ -2,7 +2,7 @@ name: PR opened
 
 on:
   pull_request:
-    types: [opened]
+    types: [opened, edited, synchronize]
 
 jobs:
   add-issue-to-pr: