⬆️ Update actions/download-artifact action to v6 (#169)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -68,7 +68,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: ⬇️ Download coverage data
-        uses: actions/download-artifact@v5.0.0
+        uses: actions/download-artifact@v6.0.0
       - name: 🏗 Set up uv
         uses: astral-sh/setup-uv@v7
         with: