Fix Codeowners Merge workflow to run on more events

Author: hyperupcall

.github/workflows/codeowners-merge.yml

@@ -1,6 +1,6 @@
 name: 'Maintenance: Codeowners Detection and Mention'
 on:
-  pull_request_target: { types: [opened] }
+  pull_request_target: { types: [opened, reopened, ready_for_review] }
   issue_comment: { types: [created] }
   pull_request_review: { types: [submitted] }