Bump actions/download-artifact from 3 to 4 in /.github/workflows

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

Author: dependabot[bot]

.github/workflows/continuous-deployment.yaml

@@ -51,7 +51,7 @@ jobs:
     needs: build
     steps:
     - name: Download release candidate
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
       with:
         name: release-candidate
         path: ./docs/