### What changes were proposed in this pull request?
The pr aims to upgrade `docker/build-push-action` from `v5` to `v6`.

### Why are the changes needed?
https://github.com/docker/build-push-action/releases/tag/v6.5.0
...
https://github.com/docker/build-push-action/releases/tag/v6.0.0
<img width="1097" alt="image" src="https://github.com/apache/spark/assets/15246973/136a0257-6a94-4771-a97c-3f703925b269">
https://docs.docker.com/build/ci/github-actions/build-summary/

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Pass GA.
Manual observation as following:
https://github.com/panbingkun/spark/actions/runs/9689581212
<img width="1003" alt="image" src="https://github.com/apache/spark/assets/15246973/43af8e42-32d3-463c-9bbf-33cf9817bc1f">

### Was this patch authored or co-authored using generative AI tooling?
No.

Closes #47112 from panbingkun/SPARK-48731.

Authored-by: panbingkun <panbingkun@baidu.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>