[Feature][Build] Upgrade the minimum version to 3.10

[gcanlin]

What this PR does / why we need it?

Closes #3728, #3657.

The main branch is now aligned with the vllm releases/v0.11.1 branch, which no longer supports Python 3.9. Check it here.

Does this PR introduce any user-facing change?

The newest version of vllm-ascend don't support Python 3.9.

How was this patch tested?

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@83f478b

[github-actions]

👋 Hi! Thank you for contributing to the vLLM Ascend project. The following points will speed up your PR merge:‌‌

• A PR should do only one thing, smaller PRs enable faster reviews.
• Every PR should include unit tests and end-to-end tests ‌to ensure it works and is not broken by other future PRs.
• Write the commit message by fulfilling the PR description to help reviewer and future developers understand.

If CI fails, you can run linting and testing checks locally according Contributing and Testing.

[gemini-code-assist]

Code Review

This pull request correctly updates the minimum required Python version to 3.10, removing support for Python 3.9. The changes across the README files and setup configuration are mostly consistent. I have added one suggestion to setup.py to also include an upper version limit for Python, which will prevent users from installing the package on unsupported versions and improve dependency resolution.

[wangxiyuan]

https://github.com/vllm-project/vllm-ascend/blob/main/docs/source/installation.md and https://github.com/vllm-project/vllm-ascend/tree/main/examples/disaggregated_prefill_v1 should be updated as well

[gcanlin]

https://github.com/vllm-project/vllm-ascend/blob/main/docs/source/installation.md and https://github.com/vllm-project/vllm-ascend/tree/main/examples/disaggregated_prefill_v1 should be updated as well

Thanks! Ready now.

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[gcanlin]

@wangxiyuan Could this PR be merged forcibly? It only changes some docs.