[ez][CI] Fix docs push in nightly workflow (#162657)

HUD metrics page says docs push hasn't happened in 21 days
<img width="293" height="142" alt="image" src="https://github.com/user-attachments/assets/f930aab8-0503-4bf2-b962-8c375dec6b78" />

I guess main branch docs just haven't been updated?  Did anyone notice?  Do we care?

Either way I think this should fix it

Likely started after https://github.com/pytorch/pytorch/pull/161182
Pull Request resolved: https://github.com/pytorch/pytorch/pull/162657
Approved by: https://github.com/huydhn

.github/workflows/nightly.yml

@@ -54,7 +54,7 @@ jobs:
       - get-label-type
     with:
       runner_prefix: "${{ needs.get-label-type.outputs.label-type }}"
-      build-environment: linux-jammy-py3.9-gcc11
+      build-environment: linux-jammy-py3.10-gcc11
       docker-image: ${{ needs.docs-build.outputs.docker-image }}
       push: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' || startsWith(github.event.ref, 'refs/tags/v') }}
       run-doxygen: true