Update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
             type=edge,branch=$repo.default_branch
 
       - name: build+push
-        uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671 # v4.0.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
 
           platforms: linux/arm64,linux/amd64,linux/arm/v7,linux/s390x,linux/386,linux/ppc64le