🗑️ feat!: drop python 3.8 support

[SigureMo]

不再支持 Python 3.8

[Copilot]

Pull Request Overview

Dropping support for Python 3.8 by raising the minimum Python version requirement and updating related documentation and CI.

• Bump project’s requires-python from >=3.8 to >=3.9
• Update install instructions in README to require Python 3.9+
• Remove Python 3.8 from GitHub Actions lint-and-fmt workflow

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updated requires-python to >=3.9 and inlined the dev list
README.md	Adjusted installation note to Python 3.9+
.github/workflows/lint-and-fmt.yml	Changed CI matrix to only run on Python 3.9

Comments suppressed due to low confidence (3)

.github/workflows/lint-and-fmt.yml:15

• The CI matrix currently only tests on Python 3.9; consider adding newer supported versions (e.g., 3.10, 3.11) to ensure compatibility across all maintained Python releases.

        python-version: ["3.9"]

pyproject.toml:16

• [nitpick] Consider preserving the original multi-line formatting for the dev dependency group to improve readability and consistency when adding more dev dependencies in the future.

dev = ["hatchling>=1.27.0"]

[SigureMo]

看起来应该 follow 一下 0.17.0、0.17.1、0.17.2 了 https://github.com/google/yamlfmt/releases @gouzil