Exclude vllm dependencies from dev extra

[albertvillanova]

Exclude vllm extra dependencies from dev extra, so it is aligned with the behavior before:

• Replace setup with pyproject and fix packaging unintended modules #4194

Before that PR, the vllm extra dependencies were not included in dev extra. See:

trl/setup.cfg

Lines 76 to 87 in 5291015

	dev =
	%(bco)s
	%(deepspeed)s
	%(judges)s
	%(liger)s
	%(peft)s
	%(quality)s
	%(quantization)s
	%(scikit)s
	%(test)s
	%(vlm)s

This PR updates the dev dependencies in the pyproject.toml file, so vllm extra dependencies are not included in the dev extra.

Fix #4228.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[albertvillanova]

The error in the associated issue is now fixed. See e.g.: https://github.com/huggingface/trl/actions/runs/18339469824/job/52231273302?pr=4229

[qgallouedec]

thanks!