FIX Import error in BOFT half precision test

[BenjaminBossan]

There was a small last minute change in #1925 that broke the tests. It should be boft.layer.Linear and not boft.Linear. As these are GPU tests, CI didn't catch this and I did not run this locally to verify.

[BenjaminBossan]

FYI @Edenzzzz the nightly tests on GPU failed, this should fix them.

[HuggingFaceDocBuilderDev]

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[sayakpaul]

Thanks. Maybe in the future we could do:
https://github.com/huggingface/diffusers/blob/main/.github/workflows/run_tests_from_a_pr.yml

This will allow us to trigger desired tests on the GPU runner.

[BenjaminBossan]

Thanks. Maybe in the future we could do: https://github.com/huggingface/diffusers/blob/main/.github/workflows/run_tests_from_a_pr.yml

This will allow us to trigger desired tests on the GPU runner.

Normally I test GPU tests locally but as this was a late change, I forgot to re-run the tests, so it was just a personal oversight.