Add python 3.10 test runs on GitHub Actions and Appveyor

[grlee77]

Description

Adding test cases for Python 3.10 on CI. NumPy, SciPy and PyWavelets should have Python 3.10 wheels now, so let's see how this goes.

Checklist

• Docstrings for all functions
• Gallery example in ./doc/examples (new features only)
• Benchmark in ./benchmarks, if your changes aren't covered by an
  existing benchmark
• Unit tests
• Clean style in the spirit of PEP8
• Descriptive commit messages (see below)

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  doc/release/release_dev.rst.

[grlee77]

It looks like we need to remove the call to bdist_wininst here since that command was deprecated in Python 3.8 and removed in Python 3.10:

scikit-image/.appveyor.yml

Line 46 in 9fea28b

- python setup.py bdist_wheel bdist_wininst

I think we can just drop it from that line, but we should perhaps just change to pip wheel . instead to be a bit more modern?

[grlee77]

@rfezzani, the following error occurred in the stitching demo, but I don't think it usually happens. I have seen multiple other recent builds pass, but I think this has also occurred in at least one other recent PR:

https://github.com/scikit-image/scikit-image/runs/4158420675?check_suite_focus=true#step:6:1580

Warning, treated as error:
/Users/runner/work/scikit-image/scikit-image/doc/examples/registration/plot_stitching.py failed to execute correctly: Traceback (most recent call last):
  File "/Users/runner/work/scikit-image/scikit-image/doc/examples/registration/plot_stitching.py", line 113, in <module>
    for dst in matching_corners]
  File "/Users/runner/work/scikit-image/scikit-image/doc/examples/registration/plot_stitching.py", line 113, in <listcomp>
    for dst in matching_corners]
AttributeError: 'NoneType' object has no attribute 'params'

I thought maybe it was an issue of differing initializations, but it does look like random seeds are set.

[grlee77]

I think these will all pass now that we pinned sphinx. let me trigger CI again to be sure

[hmaarrfk]

Sorry, can you try to rebase. I might have created conflicts with pyproject.toml

[grlee77]

Sorry, can you try to rebase. I might have created conflicts with pyproject.toml

no problem it is just the one line with Cython requirements. I will use the setting for that from the other PR. All linux CI passes now and Appveyor passed last time around, so I will go ahead and fix the conflict and merge here.

[grlee77]

I guess we still need an approval to merge. I think it should be fine to merge now, but I am fine if you want to wait until CI completes again.

[jni]

Awwwweeeesome, thank you both!!! 🎉