Bump JamesIves/github-pages-deploy-action from 4.6.1 to 4.6.4

Bumps [JamesIves/github-pages-deploy-action](https://github.com/jamesives/github-pages-deploy-action) from 4.6.1 to 4.6.4.
- [Release notes](https://github.com/jamesives/github-pages-deploy-action/releases)
- [Commits](JamesIves/github-pages-deploy-action@v4.6.1...v4.6.4)

---
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/book.yml

@@ -57,7 +57,7 @@ jobs:
           path: .book
 
       - name: GitHub Pages action
-        uses: JamesIves/github-pages-deploy-action@v4.6.1
+        uses: JamesIves/github-pages-deploy-action@v4.6.4
         with:
           branch: gh-pages          # The branch the action should deploy to.
           folder: .book             # The folder the action should deploy.