Bump cython from 0.29.23 to 0.29.24 in /python/helpers

[dependabot-preview]

Bumps cython from 0.29.23 to 0.29.24.

Changelog

Sourced from cython's changelog.

0.29.24 (2021-07-14)

Bugs fixed

• Inline functions in pxd files that used memory views could lead to invalid C code if the module that imported from them does not use memory views. Patch by David Woods. (Github issue 1415)
• Several declarations in libcpp.string were added and corrected. Patch by Janek Bevendorff. (Github issue 4268)
• Pickling unbound Cython compiled methods failed. Patch by Pierre Glaser. (Github issue 2972)
• The tracing code was adapted to work with CPython 3.10.
• The optimised in operator failed on unicode strings in Py3.9 and later that were constructed from an external wchar_t source. Also, related C compiler warnings about deprecated C-API usage were resolved. (Github issue 3925)
• Some compiler crashes were resolved. Patch by David Woods. (Github issues 4214, 2811)
• An incorrect warning about 'unused' generator expressions was removed. (GIthub issue 1699)
• The attributes gen.gi_frame and coro.cr_frame of Cython compiled generators and coroutines now return an actual frame object for introspection, instead of None. (Github issue 2306)

Commits

• 3a34c5f Prepare release of 0.29.24.
• 0660788 Update changelog.
• 8dee7f9 Fix "std::string::npos" in 'libcpp.string' and add missing C++ string methods...
• dba5f6b Stop calling PyEval_InitThreads() In Py3.7+ (where it has become a no-op).
• 0644633 Backport #2811 to fix qualified-name issues (GH-4216)
• be0159c change extension for sphinx 1.8+ (GH-4210)
• 169bab1 Add dependency file for docs build.
• da26b4a ALways mark the entry of generator expression functions as used. Because, why...
• be3b178 Apply some standard macro safety fixes.
• 8d177f4 Fix another direct usage of "tstate->use_tracing" in Py3.10.
• Additional commits viewable in compare view

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