Arm backend: Bump vela to 5.1.0

[oscarandersson8218]

Bumps vela to 5.1.0 and removes xfails that been fixed.

cc @digantdesai @freddan80 @per @zingo @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

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❌ 2 New Failures

As of commit 39c2a4f with merge base c7a0b68 ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / windows / windows-job (gh)
  examples/models/test/test_export.py::ExportTest::test_efficient_sam_export_to_executorch
• trunk / test-qnn-optimum-model (fp32, albert) / linux-job (gh)
  RuntimeError: Command docker exec -t 34d29549696b9dd1d4a8e91883b01cfbd7e7a9899f408abe1600cddb75d160f8 /exec failed with exit code 92

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[zingo]

@digantdesai I think this one needs the usual magic @per also just merged a bump of Tosa tools