Remove exception for Python 3.8 typing from linter

[hmellor]

After speaking to @gshtras I understand that it's no longer necessaray to use deprecating typing in this file.

[gemini-code-assist]

Code Review

This pull request removes a linter exception for deprecated typing syntax in vllm/utils/__init__.py. The changes update a type hint from typing.Tuple to the modern tuple syntax and remove the corresponding ignore rule from pyproject.toml. The changes are correct, self-contained, and improve code style and maintainability. The pull request looks good to merge.

[github-actions]

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