Revert "ci: replace GHPAGES_DEPLOY_KEY with MY_REPO_PAT for Pages deployment"

This reverts commit f2304e1.

Author: amrikarisma

.github/workflows/nightly-release.yaml

@@ -169,7 +169,7 @@ jobs:
       - name: Deploy INI files to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with:
-          personal_token: ${{ secrets.MY_REPO_PAT }}
+          deploy_key: ${{ secrets.GHPAGES_DEPLOY_KEY }}
           publish_dir: ./ini-pages
           destination_dir: ini
           keep_files: true