⬆️ bump actions/configure-pages from 5 to 6 (#509)

Bumps [actions/configure-pages](https://github.com/actions/configure-pages) from 5 to 6.
- [Release notes](https://github.com/actions/configure-pages/releases)
- [Commits](actions/configure-pages@v5...v6)

---
updated-dependencies:
- dependency-name: actions/configure-pages
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -130,7 +130,7 @@ jobs:
       - name: Add CNAME for custom domain
         run: echo "python-programming.quantecon.org" > _build/html/CNAME
       - name: Setup Pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@v6
       - name: Upload Pages artifact
         uses: actions/upload-pages-artifact@v4
         with: