Arm backend: Update ethos-u-vela to 4.5.0

[Erik-Lundell]

Remove new passing xfails due to new Vela version is fixing some old problems.

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16075

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❌ 4 New Failures, 1 Unrelated Failure

As of commit e2adf72 with merge base 4860984 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  examples/models/test/test_export.py::ExportTest::test_ic3_export_to_executorch
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t b743a314ee3a8d86552fce8b9ba5744e42ba01314b4cec84d2d226d7f49551bd /exec failed with exit code 1
• trunk / test-mcu-cortex-m-backend / linux-job (gh)
  RuntimeError: Command docker exec -t 575ee8da613ffd4154aafc58e3d361452781b22c571ea46d47c5cce9bf42fdcc /exec failed with exit code 1
• trunk / test-multimodal-macos (gemma3-4b) / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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

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

• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74

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[zingo]

Hi @metascroy updating Vela sometime (almost always) cause some internal problem so this would be really good if you can check internally, you might also have internal versions strings of Vela that needs bumping at the same time somewhere that @digantdesai usually handled.