Use macos-14-xlarge instead of macos-latest-xlarge which has switched…

[shoumikhin]

#13773

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13821

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❗ 1 Active SEVs

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• ROCm MI2xx CI/CD workflows failing due to : download from https://api.github.com/repos/pytorch/pytorch timed out.

❌ 1 New Failure, 94 Pending, 2 Unrelated Failures

As of commit 44991cf with merge base e42c881 ():

NEW FAILURE - The following job has failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-eval_llama-wikitext-linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

BROKEN TRUNK - The following job failed but was present on the merge base:

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

• trunk / test-huggingface-transformers-coreml (qwen3-1.7b|xnnpack|--quantize) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 138

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[jackzhxng]

Hmm seems like some different errors now, cc @huydhn

[shoumikhin]

@jackzhxng GitHub looks unreliable atm, I'll keep retrying