Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/docker.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4.2.1
+        uses: docker/build-push-action@v6.1.0
         with:
           context: .
           platforms: linux/amd64,linux/arm64,linux/arm/v7