Update docker/metadata-action action to v6

| datasource  | package                | from | to |
| ----------- | ---------------------- | ---- | -- |
| github-tags | docker/metadata-action | v5   | v6 |


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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -55,7 +55,7 @@ jobs:
 
       - name: Extract metadata (labels) for Docker
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: ${{ env.IMAGE_NAME }}
           tags: |