[docs]: Update README with Python 3.12 and dependency changes

[JimmyPeilinLi]

Updated Python version in installation instructions and adjusted KTransformers and flash-attention wheel filenames accordingly.

What does this PR do?

update readme tutorial

Before submitting

• [x] Did you read the contributor guideline?
• [x] Did you write any new necessary tests?

[gemini-code-assist[bot]]

Summary of Changes

Hello @JimmyPeilinLi, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the README.md file to reflect compatibility with Python 3.12. It modifies the installation instructions to recommend Python 3.12 and adjusts the filenames for the KTransformers and Flash-Attention wheel dependencies to ensure they align with the new Python and Torch versions, providing accurate guidance for users setting up the environment.

Highlights

• Python Version Update: The recommended Python version in the installation instructions has been updated from 3.10 to 3.12.
• KTransformers Dependency: The pip install command for KTransformers has been adjusted to reference the wheel compatible with Python 3.12 and Torch 2.7.
• Flash-Attention Dependency: The pip install command for Flash-Attention has been updated to use the wheel compatible with Python 3.12 and Torch 2.7.

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[KMSorSMS]

Could you follow the conventional rule for commit messages?