correctly fetch merged by user login

.github/workflows/update-be-new-migration-latest-timestamp.yml

@@ -38,13 +38,15 @@ jobs:
           rm added_files.txt
           git commit -m "chore: renamed new migration files to latest timestamp (gh-action)"
 
-      - name: Get the username of the person who closed the PR
-        run: |       
+      - name: Get PR details
+        id: pr_details
+        run: |
           PR_NUMBER=${{ github.event.pull_request.number }}
-          PR_CLOSER=$(curl -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" "https://api.github.com/repos/${{ github.repository }}/pulls/$PR_NUMBER" | jq -r '.closed_by.login')
+          PR_MERGER=$(curl -s "https://api.github.com/repos/${{ github.repository }}/pulls/$PR_NUMBER" | jq -r '.merged_by.login')
+          
           echo "PR Number: $PR_NUMBER"
-          echo "PR Closer: $PR_CLOSER"
-          echo "pr_closer=$PR_CLOSER" >> $GITHUB_OUTPUT
+          echo "PR Merger: $PR_MERGER"
+          echo "pr_merger=$PR_MERGER" >> $GITHUB_OUTPUT
 
       - name: Create Pull Request
         if: env.SKIP_RENAME != 'true'
@@ -54,3 +56,4 @@ jobs:
           commit-message: 'chore: renamed new migration files to latest UTC (gh-action)'
           title: 'GH Action: rename new migration file timestamp'
           branch-suffix: timestamp
+          reviewers: ${{ steps.pr_details.outputs.pr_merger }}