Pin the setuptools version in pre_build_script.sh

[dbort]

Reflects the pinned version in install_requirements.sh and pyproject.toml.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3493

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:x: 2 New Failures

As of commit ddd866f90413a3f1f97b149a063888460058cd46 with merge base 6a2d04500f453425e17aa51c079d67174c0263b1 ():

NEW FAILURES - The following jobs have failed:

* [Build Linux Wheels / pytorch/executorch / upload / manywheel-py3_8-cpu](https://hud.pytorch.org/pr/pytorch/executorch/3493#24528758489) ([gh](https://github.com/pytorch/executorch/actions/runs/8929855589/job/24528758489)) `Unable to find any artifacts for the associated workflow` * [Build M1 Wheels / pytorch/executorch / upload / wheel-py3_8-cpu](https://hud.pytorch.org/pr/pytorch/executorch/3493#24528727940) ([gh](https://github.com/pytorch/executorch/actions/runs/8929855588/job/24528727940)) `Unable to find any artifacts for the associated workflow`

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@dbort has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@dbort merged this pull request in pytorch/executorch@9371c168fec962523b739ed997d02d0aedd4bb23.