Upgrade: Bump actions/configure-pages from 2 to 3 (mysticatea#9)

Bumps [actions/configure-pages](https://github.com/actions/configure-pages) from 2 to 3.
- [Release notes](https://github.com/actions/configure-pages/releases)
- [Commits](actions/configure-pages@v2...v3)

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

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

Author: dependabot[bot]

.github/workflows/GHPages.yml

@@ -39,7 +39,7 @@ jobs:
           npm run docs:build
 
       - name: Setup Pages
-        uses: actions/configure-pages@v2
+        uses: actions/configure-pages@v3
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1