Bump JamesIves/github-pages-deploy-action from 4.6.4 to 4.6.8 (#3728)

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@920cbb3...881db53)

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

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

Author: dependabot[bot]

.github/workflows/generate-javadocs.yml

@@ -28,7 +28,7 @@ jobs:
         run: |
           ./gradlew aggregateJavadocs
       - name: Deploy
-        uses: JamesIves/github-pages-deploy-action@920cbb300dcd3f0568dbc42700c61e2fd9e6139c # [email protected].4
+        uses: JamesIves/github-pages-deploy-action@881db5376404c5c8d621010bcbec0310b58d5e29 # [email protected].8
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           BRANCH: gh-pages