ci: Update auto-merge action to use squash merging

Author: HavenDV

.github/workflows/auto-merge.yml

@@ -31,9 +31,9 @@ jobs:
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          
+
       - name: Enable auto-merge
-        run: gh pr merge --auto --merge "$PR_URL"
+        run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.PERSONAL_TOKEN }}