chore(deps): bump actions/download-artifact from 5 to 6

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -93,7 +93,7 @@ jobs:
       - name: Remove current branch files
         run: rm -rf ${{ steps.clean_branch.outputs.CLEAN_BRANCH }}
       - name: Retrieve github pages artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: github-pages
           path: ${{ steps.clean_branch.outputs.CLEAN_BRANCH }}