Update docker/build-push-action action to v6.6.0

Author: renovate[bot]

.github/workflows/docker.yml

@@ -40,7 +40,7 @@ jobs:
             type=edge,branch=$repo.default_branch
 
       - name: build+push
-        uses: docker/build-push-action@5176d81f87c23d6fc96624dfdbcd9f3830bbe445 # v6.5.0
+        uses: docker/build-push-action@4f7cdeb0f05278b464e71357394bf2c61f94138e # v6.6.0
         with:
           platforms: linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
           push: ${{ github.ref == 'refs/heads/master' }}