Deprecate Transformers v4 support#45161
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As stated in the warnings, Transformers v4 support is to be completely removed in vLLM 0.24.0. Now is the right time to do this as v0.24.0 is the next release to be cut from
main.This PR removes support for installing Transformers v4. Support for models created with Transformers v4 should be maintained.
This also allows us to use a much more flexible Transformers pin in
requirements/common.txtso users can install vLLM with new versions of Transformers for better day-0 model support.