MAINT: Fix version of wheel to support Python 3.10

[frenzymadness]

The latest version of numpy is not installable from source code with Python 3.10. The reason is a bug (incompatibility) in the older versions of wheel package. For more info see this issue: pypa/wheel#354

The problem is already fixed in the latest wheel release (0.36.2).
What happens when you try to install the latest numpy from the master branch with Python 3.10:

pip install .
Processing /home/lbalhar/Software/numpy
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Building wheels for collected packages: numpy
  Building wheel for numpy (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
… more than 2000 lines of output …
  AssertionError: would build wheel with unsupported tag ('cp310', 'cp310', 'linux_x86_64')

With this patch it works like a charm:

pip install .
Processing /home/lbalhar/Software/numpy
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Building wheels for collected packages: numpy
  Building wheel for numpy (PEP 517) ... done
  Created wheel for numpy: filename=numpy-1.21.0.dev0+722.gf6a71feac-cp310-cp310-linux_x86_64.whl size=19243966 sha256=02a8e24b3642ed0f5ae6d90984bb3f142a3f0089d0bd40d855ea644bf9f9d26e
  Stored in directory: /tmp/pip-ephem-wheel-cache-m_vxju0i/wheels/44/94/c3/357b79921baf29908a3c5fdcb200e26e772f557fb67941dcfc
Successfully built numpy
Installing collected packages: numpy
Successfully installed numpy-1.21.0.dev0+722.gf6a71feac

pip list
Package    Version
---------- --------------------------
Cython     0.29.21
numpy      1.21.0.dev0+722.gf6a71feac
pip        21.0.1
setuptools 53.0.0
wheel      0.36.2

[mattip]

Seems reasonable, if CI doesn't expose any backward-incompatibilities.

[charris]

Thanks @frenzymadness .

[pllim]

Hello. Which Numpy version will this patch be in? Thanks!

[charris]

1.21.x will be the first to support Python 3.10 but we won't release wheels for it until 3.10.0 is released.

[frenzymadness]

Not releasing wheels before the final version of Python is out is okay (even it makes every installation much longer) but this fix is important also for installing from the sources. Right now, the installation from the source code fails unless you use pip install --no-use-pep517 numpy.

[jrd]

Python 3.10 rc1 is out (ABI is frozen), so it’s reasonable to make wheels now, no?

[charris]

Python 3.10 rc1 actually broke some things.

[jrd]

Yes I just saw that (with power function)