MAINT: Bump cython from 0.29.21 to 0.29.22

[dependabot-preview]

Bumps cython from 0.29.21 to 0.29.22.

Changelog

Sourced from cython's changelog.

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)

Commits

• 3e470fc Add 3.9 to the list of supported Python versions.
• fc777dd Prepare release of 0.29.22.
• 0f2fc1e Update changelog.
• 591044b MAINT: Add const qualifiers to char* types in pycapsule.pxd.
• bb94c0e Make a working test actually test something.
• ae4e39d Clean up test file.
• 7d69ae0 Don't crash when probing type of cimported module (GH-4001)
• 921cd96 Merge pull request #3972 from da-woods/cpdef_error_message_0.29
• adfcde1 Error message on cpdef variables
• 5377ae7 Merge pull request #3933 from vstinner/py_set_type
• Additional commits viewable in compare view

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