Renovate: Update docker/build-push-action action to v7

Author: renovate[bot]

.github/workflows/build_container.yaml

@@ -34,7 +34,7 @@ jobs:
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           labels: ${{ steps.meta.outputs.labels }}