Bump Optimum ET pin

[jackzhxng]

No description provided.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14333

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 19622ec with merge base a1ed4ed ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (profiling) / build (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d587ad2b749a37f99fbe5ce922268867731601eba0f7ca2af1439e376c69e112 /exec failed with exit code 1

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)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

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[mergennachin]

There are still a lot of failures in CI

[jackzhxng]

@kirklandsign these are the errors that are being fwd fixed right?

[mergennachin]

Okay let's rebase once the forward fix is in