Bump cython from 0.29.14 to 0.29.23 in /python/helpers

[dependabot-preview]

Bumps cython from 0.29.14 to 0.29.23.

Changelog

Sourced from cython's changelog.

0.29.23 (2021-04-14)

Bugs fixed

• Some problems with Python 3.10 were resolved. Patches by Victor Stinner and David Woods. (Github issues #4046, #4100)
• An incorrect "optimisation" was removed that allowed changes to a keyword dict to leak into keyword arguments passed into a function. Patch by Peng Weikang. (Github issue #3227)
• Multiplied str constants could end up as bytes constants with language_level=2. Patch by Alphadelta14 and David Woods. (Github issue #3951)
• PY_SSIZE_T_CLEAN does not get defined any more if it is already defined. Patch by Andrew Jones. (Github issue #4104)

0.29.22 (2021-02-20)

Features added

• Some declarations were added to the provided pxd includes. Patches by Zackery Spytz and John Kirkham. (Github issues #3811, #3882, #3899, #3901)

Bugs fixed

• A crash when calling certain functions in Py3.9 and later was resolved. (Github issue #3917)
• const memory views of structs failed to compile. (Github issue #2251)
• const template declarations could not be nested. Patch by Ashwin Srinath. (Github issue #1355)
• The declarations in the cpython.pycapsule module were missing their const modifiers and generated incorrect C code. Patch by Warren Weckesser. (Github issue #3964)
• Casts to memory views failed for fused dtypes. Patch by David Woods. (Github issue #3881)
• repr() was assumed to return str instead of unicode with language_level=3. (Github issue #3736)
• Calling cpdef functions from cimported modules crashed the compiler. Patch by David Woods. (Github issue #4000)
• Cython no longer validates the ABI size of the NumPy classes it compiled against. See the discussion in numpy/numpy#432
• A C compiler warning about enum value casting was resolved in GCC. (Github issue #2749)
• Coverage reporting in the annotated HTML file failed in Py3.9. Patch by Nick Pope. (Github issue #3865)
• The embedding code now reports Python errors as exit status.
• Long type declarations could lead to (harmless) random changes in the C file when used in auto-generated Python wrappers or pickled classes.

Other changes

• Variables defined as cpdef now generate a warning since this is currently useless and thus does not do what users would expect. Patch by David Woods. (Github issue #3959)

0.29.21 (2020-07-09)

Bugs fixed

• Fix a regression in 0.29.20 where __div__ failed to be found in extension types. (Github issue #3688)
• Fix a regression in 0.29.20 where a call inside of a finally clause could fail to compile. Patch by David Woods. (Github issue #3712)
• Zero-sized buffers could fail to validate as C/Fortran-contiguous. Patch by Clemens Hofreither. (Github issue #2093)
• exec() did not allow recent Python syntax features in Py3.8+ due to https://bugs.python.org/issue35975. (Github issue #3695)

... (truncated)

Commits

• 1767078 Fix embed test in Py2.6.
• 05be94a Try to resolve apt install issues on travis.
• e3ee22d Remove "PYTHONHOME" setting from embed-test since it seems to break the I/O e...
• d715643 Make embed test more debuggable by printing the path setup and the build outp...
• b6077b2 Update changelog.
• 7c0585e Summarize test failures when running in shards.
• 315c20e Only #define PY_SSIZE_T_CLEAN if it is not already #defined
• c0d5282 Test runner statistics: show the most time intensive test steps (compilatio/r...
• dd7fd78 Work around a test failure in Py3.10.
• 66690e7 Fix string constant folding with language_level=2 (GH-4083)
• Additional commits viewable in compare view

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Superseded by #231.