Bump up the transformers version to v4.49.0

[WoosukKwon]

As transformers v4.49.0 is now released, we can bump up the version in our dependency.

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[DarkLight1337]

Can you remove the corresponding note in the Supported Models page (which asks users to install dev transformers) since it's unnecessary now?

[WoosukKwon]

@DarkLight1337 Nice catch. Removed the note.

[jeejeelee]

We also need to modify https://github.com/vllm-project/vllm/blob/hf-4.49/requirements-test.txt#L633, right?

[WoosukKwon]

@jeejeelee Nice catch! updated it.

[DarkLight1337]

Let's also update

vllm/tests/models/decoder_only/vision_language/test_models.py

Line 124 in ad5a35c

# TODO(ywang96): Move Qwen2-VL out of core models in favor of Qwen2.5-VL

[WoosukKwon]

superseded by #13602