Downgrade setuptools in post-training to 80.10.2

[SurbhiJainUSC]

Description

uv pip install -e .[tpu-post-train] --resolution=lowest
install_tpu_post_train_extra_deps
tensorboard

fails with the error: ModuleNotFoundError: No module named 'pkg_resources'

This PR downgrades setuptools for tensorboard to run.

Tests

uv pip install -e .[tpu-post-train] --resolution=lowest
install_tpu_post_train_extra_deps
tensorboard

Checklist

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• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
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• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.