Arm backend: Fix mypy warnings in test/tester

[perheld]

Signed-off-by: per.held@arm.com
Change-Id: Ia282b3edab43ebea758eba6898e536652837a732

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15553

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❌ 1 New Failure, 5 Pending, 1 Unrelated Failure

As of commit d10b60d with merge base 964515c ():

NEW FAILURE - The following job has failed:

• trunk / test-qnn-optimum-model (fp32, roberta) / linux-job (gh)
  RuntimeError: Command docker exec -t c983771fc991ee18bf1a38deab77c8774ce13c6a841fb0c6cbd58328641a06e9 /exec 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

• trunk / unittest-release / windows / windows-job (gh) (trunk failure)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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[perheld]

Those errors for lstm needs to be investigated if this change is related or what is going on.

[perheld]

Yes, it is related. Fix incoming.

[perheld]

#15557 is the fix for lstm, once that is in this can be rebased and hopefully passing. :)

[zingo]

Test fails is unrelated