Arm backend: Avoid flakyness for mv2 by bumping ATOL/RTOL

[zingo]

cc @digantdesai @freddan80 @per @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8771

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❌ 2 Cancelled Jobs, 1 Unrelated Failure

As of commit 2e21dc9 with merge base 40d399a ():

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

• trunk / test-models-macos (cmake, resnet50, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos (cmake, vit, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

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

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

• trunk / test-pip-install-editable-mode-macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[oscarandersson8218]

Looks good to me!

[zingo]

MacOS fails unrelated