Update actions/download-artifact action to v7

| datasource  | package                   | from | to |
| ----------- | ------------------------- | ---- | -- |
| github-tags | actions/download-artifact | v4   | v7 |


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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -132,13 +132,13 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Download digests (amd64)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           name: digests-${{ matrix.version }}-linux-amd64
           path: /tmp/digests
 
       - name: Download digests (arm64)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v7
         with:
           name: digests-${{ matrix.version }}-linux-arm64
           path: /tmp/digests