Bump actions/download-artifact from 5 to 6 (#3185)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  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/reusable-deploy-docs.yaml

@@ -53,7 +53,7 @@ jobs:
       USER_NAME: "github-actions[bot]"
     steps:
     - name: Download the build archive
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: package-docs-build