build(deps): update docker/build-push-action digest to b32b51a (#1373)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://redirect.github.com/docker/build-push-action)
| action | digest | `48aba3b` -> `b32b51a` |

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.github/workflows/build.yml

@@ -48,7 +48,7 @@ jobs:
           CGO_CFLAGS: -I/tmp/libwebp/include -I/tmp/libaom/include
           CGO_LDFLAGS: -L/tmp/libwebp/lib -lwebp -L/tmp/libaom/lib -laom -lm
         name: Build and push
-        uses: docker/build-push-action@48aba3b46d1b1fec4febb7c5d0c644b249a11355 # v6
+        uses: docker/build-push-action@b32b51a8eda65d6793cd0494a773d4f6bcef32dc # v6
         with:
           cache-from: type=gha
           cache-to: type=gha,mode=max