Pin pytest<9

[pytorchbot]

Summary

Trying to fix failing CI. Seems like something is up with our subtests that causes a failure deep cloning in the pytest code. I'm going to pin pytest<9 for now.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15835

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❌ 1 New Failure, 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 5ae1b4a with merge base e0dda90 ():

NEW FAILURE - The following job has failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 82099e4ee6560eccc5ab6338b2ec0d3a4dd0d33d2b55059dba0e52e4676904af /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

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

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

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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