build(deps): update docker/build-push-action digest to b32b51a

Author: renovate[bot]

.github/workflows/publish.yml

@@ -113,7 +113,7 @@ jobs:
         with:
           platforms: linux/amd64,linux/arm64
       - name: Build and publish model-server Docker image
-        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355 # v6
+        uses: docker/build-push-action@b32b51a8eda65d6793cd0494a773d4f6bcef32dc # v6
         with:
           context: ./model-server
           file: ./model-server/Dockerfile