chore(github-action): update docker/build-push-action digest to ca877d9 (#29846)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[docker/build-push-action](https://redirect.github.com/docker/build-push-action)
| action | digest | `4f58ea7` -> `ca877d9` |

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containers/apps/kube-sa-proxy/.github/workflows/docker-publish.yml

@@ -34,7 +34,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75 # v6
+        uses: docker/build-push-action@ca877d9245402d1537745e0e356eab47c3520991 # v6
         with:
           context: .
           push: true