build(deps): bump JamesIves/github-pages-deploy-action

Bumps [JamesIves/github-pages-deploy-action](https://github.com/jamesives/github-pages-deploy-action) from 4.6.4 to 4.6.8.
- [Release notes](https://github.com/jamesives/github-pages-deploy-action/releases)
- [Commits](https://github.com/jamesives/github-pages-deploy-action/compare/v4.6.4...v4.6.8)

---
updated-dependencies:
- dependency-name: JamesIves/github-pages-deploy-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/upload-doc.yml

@@ -30,7 +30,7 @@ jobs:
         run: echo '<meta http-equiv="refresh" content="0;url=actix_server/index.html">' > target/doc/index.html
 
       - name: Deploy to GitHub Pages
-        uses: JamesIves/github-pages-deploy-action@v4.6.4
+        uses: JamesIves/github-pages-deploy-action@v4.6.8
         with:
           folder: target/doc
           single-commit: true