[CI] Cleanup additional_dependencies: [toml] for pre-commit yapf hook

[yankay]

In https://github.com/vllm-project/vllm/blob/main/.pre-commit-config.yaml , there is a TODO note: "Remove when yapf is upgraded."

This PR #12475 , yapf was upgraded from v0.32.0 to v0.43.0. According to yapf's changelog, starting from v0.40.2, toml is now included by default in additional_dependencies, making explicit declaration unnecessary.

This cleanup removes the redundant configuration.

[github-actions]

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[yankay]

HI @mgoin @hmellor

Would you please help to review it :-)

[hmellor]

Can you verify that this still works when pre-commit is used in a Python 3.9 environment? That's my only concern

[yankay]

Can you verify that this still works when pre-commit is used in a Python 3.9 environment? That's my only concern

HI @hmellor

It can be run in the Python 3.9, screen shoot: