[Fix] cython 3.0 generates incorrect code for python stable api

[oraluben]

Fixes an issue mentioned in wechat group.

The fix is a side effect of cython pr: cython/cython#6055

Also fixes a ci failure in python 3.9 cc @SiriusNEO

Summary by CodeRabbit

• Chores
  • Bumped build-system requirements to a newer Cython version for improved build compatibility.
• Refactor
  • Adjusted public type annotations for broader Python compatibility.
  • Added a small public alias to clarify buffer-like types.

[github-actions]

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[coderabbitai]

📝 Walkthrough

Walkthrough

Replaces Python 3.10 union syntax with typing.Union in public type aliases and adds a new BufferLikeTypeTuple; also bumps Cython build-system requirement from >=3.0.0 to >=3.1.0 in pyproject.toml.

Changes

Cohort / File(s)	Summary
Build System Dependencies pyproject.toml	Bump Cython build requirement from >=3.0.0 to >=3.1.0.
Typing Public API tilelang/_typing.py	Replace `A

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐇 A nibble of types, unions made new,
I hopped through hints and tightened the glue.
Cython climbed a notch, the build hums along —
I celebrate with a twitch and a tiny song. ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title mentions fixing an issue with Cython 3.0 and Python stable API, but the actual changes involve bumping Cython to 3.1.0 and converting union syntax to typing.Union for Python 3.9 compatibility.	Consider whether the title should be more specific about Python 3.9 compatibility or the Cython version requirement change, as these are the main technical changes.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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