Bump cython from 0.29.14 to 0.29.21 in /python/helpers

[dependabot-preview]

Bumps cython from 0.29.14 to 0.29.21.

Changelog

Sourced from cython's changelog.

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)
• Binding staticmethods of Cython functions were not behaving like Python methods in Py3. Patch by Jeroen Demeyer and Michał Górny. (Github issue #3106)
• Pythran calls to NumPy methods no longer generate useless method lookup code.
• The PyUnicode_GET_LENGTH() macro was missing from the cpython.* declarations. Patch by Thomas Caswell. (Github issue #3692)
• The deprecated PyUnicode_*() C-API functions are no longer used, except for Unicode strings that contain lone surrogates. Unicode strings that contain non-BMP characters or surrogate pairs now generate different C code on 16-bit Python 2.x Unicode deployments (such as MS-Windows). Generating the C code on Python 3.x is recommended in this case. Original patches by Inada Naoki and Victor Stinner. (Github issues #3677, #3721, #3697)
• Some template parameters were missing from the C++ std::unordered_map declaration. Patch by will. (Github issue #3685)
• Several internal code generation issues regarding temporary variables were resolved. (Github issue #3708)

0.29.20 (2020-06-10)

Bugs fixed

• Nested try-except statements with multiple return statements could crash due to incorrect deletion of the except as target variable. (Github issue #3666)
• The @classmethod decorator no longer rejects unknown input from other decorators. Patch by David Woods. (Github issue #3660)
• Fused types could leak into unrelated usages. Patch by David Woods. (Github issue #3642)
• Now uses Py_SET_SIZE() and Py_SET_REFCNT() in Py3.9+ to avoid low-level write access to these object fields. Patch by Victor Stinner. (Github issue #3639)
• The built-in abs() function could lead to undefined behaviour when used on the negative-most value of a signed C integer type. Patch by Serge Guelton. (Github issue #1911)
• Usages of sizeof() and typeid() on uninitialised variables no longer produce a warning. Patch by Celelibi. (Github issue #3575)
• The C++ typeid() function was allowed in C mode. Patch by Celelibi. (Github issue #3637)
• The error position reported for errors found in f-strings was misleading. (Github issue #3674)
• The new c_api_binop_methods directive was added for forward compatibility, but can only be set to True (the current default value). It can be disabled in Cython 3.0.

0.29.19 (2020-05-20)

Bugs fixed

• A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math". (Github issue #3622)
• A platform specific test failure in 0.29.18 was fixed. Patch by smutch. (Github issue #3620)

0.29.18 (2020-05-18)

Bugs fixed

• Exception position reporting could run into race conditions on threaded code. It now uses function-local variables again.
• Error handling early in the module init code could lead to a crash.

Commits

• 976f548 Update changelog.
• 8f586aa Disable test in Py2.6.
• 13eb449 Using Py_UNICODE to store lone surrogates makes Py3 join surrogate pairs on 1...
• f17dc17 Improve test output in case of failures.
• 94a4c90 Update changelog.
• 21c3483 Add missing unordered_map template defaults (GH-3686)
• 6e3c956 Update changelog.
• 34ab658 Always consider 0-sized arrays as C- and F-contiguous (GH-3728)
• 1910ad2 Update changelog.
• d1e4203 Fix test in 16-bit Unicode deployments.
• Additional commits viewable in compare view

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Superseded by #177.