Update dependent numpy version fron 1.19 -> 1.22 : Supports python3.10

[EisbarGFX]

Numpy now supports python 3.10 in its latest 1.22 release, however, opencv-python still uses 1.19 as its dependent version when installing via pip. Ideally, it would be best to update the numpy version to at least provide the option of using 3.10, even with the likelihood of bugs in other sections of the opencv code still present.

Currently, installing with pip leads to a rather large error with the line setup.py:67: RuntimeWarning: NumPy 1.19.3 may not yet support Python 3.10. after collecting numpy. However, issues posted on the numpy github show that they have had support for Python 3.10 releases for almost a full year now, with RC1 on 1.22dev being the most recent.

[asenyaev]

At this moment, numpy 1.22 is not released and the latest version of numpy is 1.21.2. Numpy 1.21.2 release notes said: "The Python versions supported for this release are 3.7-3.9. The 1.21.x series is compatible with Python 3.10.0rc1 and Python 3.10 will be officially supported after it is released", what means that it is not supported officially at the moment. Moreover, GitHub Actions do not support python 3.10 too (in docs: "We are trying to build and release new versions of Python as soon as they are released").
We will update numpy and python versions as soon as they officially released.

[cclauss]

This issue is misnamed. Given the Py3.10 statements at https://github.com/numpy/numpy/releases this issue should emphasize the currently released numpy 1.21, not future numpy 1.22 releases.

https://www.python.org/downloads/release/python-3100rc2
https://github.com/actions/python-versions/releases --> 3.10.0-rc.2

[cclauss]

I could not make this work. Py3.10 release is scheduled for Oct. 4th.

[asenyaev]

@EisbarGFX @cclauss I'm working on it, almost all platforms are prepared, only MacOS left. PR will be as soon as possible.

[asmorkalov]

Enabled Python 3.10 support in OpenCV 4.5.4 release. Packages for Python prior 3.10 have old dependency for compatibility. Packages for Python 3.10 depends on numpy 1.22.