Update cython requirement from <4,>=3.2.5 to >=3.2.6,<4 in /sdks/python

[dependabot]

Updates the requirements on cython to permit the latest version.

Changelog

Sourced from cython's changelog.

3.2.6 (2026-06-24)

Bugs fixed

• @functools.wraps() was broken in Py3.14+ for Cython compiled functions. (Github issue :issue:7675)

• A double-free in the t-string code was fixed. (Github issue :issue:7712)

• The - operator declarations for iterators in libcpp.vector we corrected. Patch by Vadim Markovtsev. (Github issue :issue:7717)

• The shared utility code module no longer uses a temporary file path that changed the C code on each generation. (Github issue :issue:7723)

• On 32 bit platforms, cached constants are no longer made immortal during module import. (Github issue :issue:7744)

Other changes

• Binary wheels are now built with -DNDEBUG to discard runtime assertions from CPython's inline functions.

3.2.5 (2026-05-23)

Bugs fixed

• A compile failure was fixed when using the walrus operator inside of try-except. (Github issue :issue:7462)

• Expressions with side-effects as object argument to isinstance() could get evaluated multiple times, e.g. when they use the walrus operator. (Github issue :issue:7670)

• Several problems generating the shared utility module were resolved, including a performance regression with memory views. (Github issues :issue:7487, :issue:7497, :issue:7504, :issue:7558)

• Some GC and refcounting issues were resolved for Cython functions in the Limited API. (Github issue :issue:7594)

• Refcounting errors and error handling issues were resolved in some rare error handling cases.

... (truncated)

Commits

• f49dd24 Disable failing test in Py3.8.
• e377190 Update changelog.
• 98635e5 Fix functools.wraps on cyfunctions on 3.14+ by providing a basic `_annotate...
• 1d797c1 Update changelog.
• c57a7c7 pypy fails test_nocopy_star_args (#7711)
• c94acfe Build: Compile with -DNDEBUG to discard asserts in CPython's inline functions.
• 3a75be0 Fix a deprecation warning in regex usage.
• 56b4db9 Prepare release of 3.2.6.
• 7ea9737 CI: Remove PyPy pin now that there is a bug fix release.
• fa7ef68 Update changelog.
• Additional commits viewable in compare view

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