pyproject: allow building against Cython 3.1

[jelly]

Arch Linux already builds against Cython 3.1.6 with v0.6.6, but in v0.6.7 the Cython version checked was restricted to 3.0.x while it compiles and the tests pass against 3.1.6.

Summary by CodeRabbit

• Chores
  • Updated build system dependency version constraints to support newer compatible releases.

[coderabbitai]

Walkthrough

Updated the Cython build-system dependency version constraint from ~=3.0.11 to <=3.2, broadening compatibility to allow Cython versions up to 3.2.x.

Changes

Cohort / File(s)	Summary
Build system dependency update pyproject.toml	Modified Cython version constraint in build-system.requires from ~=3.0.11 to <=3.2, permitting newer minor and patch releases within the 3.x series up to 3.2

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A version constraint, loosened with care,
From three-point-oh to three-point-two there,
Cython now hops through releases anew,
Building with freedom—dependencies too! ✨

Pre-merge checks and finishing touches

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'pyproject: allow building against Cython 3.1' accurately summarizes the main change in the changeset. It clearly indicates that the modification involves the pyproject configuration file and specifically addresses enabling compatibility with Cython 3.1, which aligns with the actual change from 'Cython~=3.0.11' to 'Cython<=3.2'. The title is concise, specific, and directly reflects the primary objective of the PR.

✨ Finishing touches

🧪 Generate unit tests (beta)

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

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

pyproject.toml (1)

3-3: Add an explicit lower bound to the Cython version constraint.

The constraint Cython<=3.2 lacks a lower bound, which could allow potentially incompatible older versions to be installed. While the previous constraint ~=3.0.11 restricted to [3.0.11, 3.1.0), the new constraint should maintain a minimum version requirement.

Apply this diff to explicitly specify both lower and upper bounds:

-    "Cython<=3.2",
+    "Cython>=3.0.11,<=3.2",

Alternatively, if broader compatibility is desired:

-    "Cython<=3.2",
+    "Cython>=3.0.11,<4.0",

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d64b462 and e40dbb0.

📒 Files selected for processing (1)

• pyproject.toml (1 hunks)

🔇 Additional comments (1)

pyproject.toml (1)

2-5: Cython version constraint is valid and supports the intended range.

The <=3.2 constraint correctly allows Cython 3.1.x versions (3.1.6 through 3.1.0 are available on PyPI) and is forward-compatible with any future 3.2.0 release. The constraint properly rejects 3.2.1 and higher. No compatibility issues detected.