chore(deps): bump actions/download-artifact in /.github/workflows (#567)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v3...v4)

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

.github/workflows/deploy-pages.yml

@@ -71,13 +71,13 @@ jobs:
           ref: ${{ inputs.ref || github.ref }}
 
       - name: Download artifact (tagged)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: docs
           path: docs/build
 
       - name: Download artifact (latest)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: docs-dev
           path: docs/build/dev