Bump JamesIves/github-pages-deploy-action from 4.6.4 to 4.6.8

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](JamesIves/github-pages-deploy-action@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/docs.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           name: documentation
           path: html/
-      - uses: JamesIves/github-pages-deploy-action@v4.6.4
+      - uses: JamesIves/github-pages-deploy-action@v4.6.8
         if: ${{ inputs.publish }}
         with:
           branch: gh-pages