[tests] enable test_vera_dtypes on XPU

[faaany]

Hi, this PR enables the BF16 test on XPU. Below is the result after fix:

pytest -rA tests/test_vera.py::TestVera::test_vera_dtypes[dtype2]

================================================= short test summary info ==================================================
PASSED tests/test_vera.py::TestVera::test_vera_dtypes[dtype2]
=============================================== 1 passed, 1 warning in 4.63s ===============================================

[BenjaminBossan]

Thanks for this PR to enable the test on XPU. I take it that XPU always supports bf16? I don't have a means to check that.

I made a suggestion to improve the readability of the test, otherwise LGTM.

[faaany]

done~

[HuggingFaceDocBuilderDev]

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[faaany]

I think this failed test is not related to my PR. Could you help retrigger the CI? Thx! @BenjaminBossan

[BenjaminBossan]

Thanks for taking care of testing on XPU, LGTM.