Bump cython from 3.1.2 to 3.2.4 in /python/helpers in the common group

[dependabot]

Bumps the common group in /python/helpers with 1 update: cython.

Updates cython from 3.1.2 to 3.2.4

Release notes

Sourced from cython's releases.

3.2.4

No release notes provided.

3.2.3-1

No release notes provided.

3.2.2

No release notes provided.

3.2.1

No release notes provided.

3.2.0 (2025-11-05)

(Complete changelog for the 3.2.0 release, including pre-releases.)

Features added

• Builtin exception types are now inferred. (Github issue :issue:6908)

• The list of known, inferred and optimised Python builtins was updated. range is now considered a type. ascii, bin, format, hex, oct were added as functions. (Github issue :issue:6931)

• The f-string syntax was extended according to PEP-701. (Github issue :issue:5452)

• t-strings are implemented according to PEP-750. The implementation backports the template classes but prefers existing backports if installed separately. (Github issue :issue:6811)

• Unknown return type annotations with -> are no longer rejected but produce warnings. This allows better integration with Python type hints that are not always usable for Cython. -> None is also allowed now. Patch by jpe. (Github issue :issue:6946)

• The runtime Python dispatch for fused functions is substantially faster. (Github issues :issue:1385, :issue:6996)

• Freelists (via cdef class decorator and for internally used types such as async) are now also used in the Limited API and with extension type specs enabled. (Github issue :issue:7151)

• Module imports now quickly check for an already imported module to speed up reimports. Patch by Lysandros Nikolaou. (Github issue :issue:7035)

• Type checks on PEP-604 union types (int | None) are optimised into separate checks.

... (truncated)

Changelog

Sourced from cython's changelog.

3.2.4 (2026-01-04)

Features added

• In preparation of Cython 3.3, a new decorator @collection_type(tname) can be used to advertise an extension type as being a 'sequence' or 'mapping'. This currently only has the effect of setting the Py_TPFLAGS_SEQUENCE flag on the type or not, but is provided for convenience to allow using the new decorator already in Cython 3.2 code.

• Several C++ exception declarations were added to libcpp.exceptions. (Github issue :issue:7389)

Bugs fixed

• Pseudo-literal default values of function arguments like arg=str() could generate invalid C code when internally converted into a real literal. (Github issue :issue:6192)

• The pickle serialisation of extension types using the auto_pickle feature was larger than necessary since 3.2.0 for types without Python object attributes. It is now back to the state before 3.2.0 again. (Github issue :issue:7443)

• Constants are now only made immortal on freethreading Python if they are not shared. (Github issue :issue:7439)

• PyDict_SetDefaultRef() is now used when available to avoid temporary borrowed references. (Github issue :issue:7347)

• Includes all fixes as of Cython 3.1.8.

3.2.3 (2025-12-14)

Features added

• The C-API declarations were updated to include the new PyList_*() functions. (Github issue :issue:7291)

• The Py_mod_gil module setting can now be changed with a C macro, overriding the freethreading_compatible directive setting. (Github issue :issue:7404)

Bugs fixed

... (truncated)

Commits

• 21bda42 Update changelog.
• ea5e926 Define missing C++ exception classes (#7389)
• c533d67 Add sequence return type annotations in Parsing.py (GH-7416)
• d056a18 Allow 'mapping' as @​collection_type() in preparation of 3.3, but without actu...
• d347c82 Remove exclusion of collection_type in test (#7442)
• fd6e825 Merge branch '3.1.x' into 3.2.x
• ce5c6cb Update changelog.
• 74b97f9 Fix arg=str() default argument (GH-6193)
• 9c9e5c7 Avoid immortalizing anything shared on freethreading (GH-7439)
• 9d5507b Fix accidental inefficiency in auto-pickling that always stored the object st...
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Summary by cubic

Update Cython in python/helpers from 3.1.2 to 3.2.4 to pick up upstream fixes and improve compatibility with newer Python releases.

^{Written for commit ed35f8a. Summary will update on new commits.}

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