Bump actions/download-artifact from 2 to 3

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 3.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v2...v3)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/deploy.yml

@@ -60,7 +60,7 @@ jobs:
 
     steps:
       - name: Download generated Jekyll site
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: generated-site
       - run: tar xvf site.tar