fix: Remove bitsandbytes installation when running cpu-only install

[Hugoch]

What does this PR do?

It removes the installation of bitsandbytes when doing a make install-cpu. The package is not needed on non-CUDA arch and fails to install on Darwin architecture as 0.43.0 removed support for the MacOS arch.

Fixes #2214

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@OlivierDehaene OR @Narsil

[drbh]

lgtm! thanks for updating.

longer term I think we'll want to rename requirements_cuda in install-server since its used for cpu installs. However those changes are outside of the scope of this PR and we can revisit them soon