Relax CoreML fp16 MV3 tolerances

[GregoryComer]

Summary

The CoreML MV3 test in fp16 is occasionally failing in CI. Bump the tolerances further. From some local investigation, the model seems to be working as intended and just has a wide deviation in f16.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19528

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• Run pull jobs on OSDC in pull requests shadow mode

❌ 2 New Failures, 9 Pending

As of commit 62f43d4 with merge base bd5752a ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_mv2_model
• pull / unittest-editable / macos / macos-job (gh)
  exir/tests/test_joint_graph.py::TestJointGraph::test_joint_graph

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[github-actions]

This PR needs a release notes: label

If your change should be included in the release notes (i.e. would users of this library care about this change?), please use a label starting with release notes:. This helps us keep track and include your important work in the next release notes.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "release notes: none"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.