build(deps): bump actions/deploy-pages from 2.0.3 to 2.0.4

Bumps [actions/deploy-pages](https://github.com/actions/deploy-pages) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/actions/deploy-pages/releases)
- [Commits](https://github.com/actions/deploy-pages/compare/v2.0.3...v2.0.4)

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

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

.github/workflows/docs.yaml

@@ -73,4 +73,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v2.0.3
+        uses: actions/deploy-pages@v2.0.4