chore(deps): update docker/metadata-action action to v6

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

Author: renovate[bot]

.github/workflows/solidity.yml

@@ -284,7 +284,7 @@ jobs:
 
       - name: Docker meta
         id: docker_meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ghcr.io/${{ github.repository }}