Test google/pthreadpool fix

[GregoryComer]

Summary

Testing a fix for google/pthreadpool Windows hang on process exit - will try to upstream if this works. See #19027.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19237

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⚠️ 1 Awaiting Approval, 3 Unrelated Failures

As of commit 9c5af4b with merge base e84a418 ():

AWAITING APPROVAL - The following workflow needs approval before CI can run:

• periodic (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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