release pin on pytest

[k-dominik]

Final blocking thing preventing us from updating Python was pytest. This updates pytest from 3.x pin to 7.2.0 (latest, not pinned)

There were some small real issues

• tmp_path magic that would resolve symlinks vs tempfile.mk* not doing it.
• in one of the tests, we use pytester, which is supposed to run tests in a more isolated manner (guess that was the motivation for using it, from the docs I take it is used to test pytest itself). Behavior of pytester testdir fixture seems to have changed - since pytest 3.x. I didn't dig into the pytest source code, but somehow invoking run seems to alter the environment for subsequent calls to run in the same test function. Splitting those functions means better reporting anyway. (In addition we could think about dropping the use of pytester here - I'm not sure it's supposed to be used outside the context of testing pytest itself).

while debugging I simplified appveyor.yml a bit - but these changes are unrelated and I can also remove them.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -1.47 ⚠️

Comparison is base (e093db4) 54.37% compared to head (9bfddc8) 52.91%.

❗ Current head 9bfddc8 differs from pull request most recent head 055b2c4. Consider uploading reports for the commit 055b2c4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2633      +/-   ##
==========================================
- Coverage   54.37%   52.91%   -1.47%     
==========================================
  Files         519      511       -8     
  Lines       60862    60265     -597     
  Branches     8398     8260     -138     
==========================================
- Hits        33095    31889    -1206     
- Misses      26094    26766     +672     
+ Partials     1673     1610      -63     

Impacted Files	Coverage Δ
ilastik/ilastik_logging/default_config.py	76.27% <100.00%> (+3.38%)	⬆️

... and 87 files with indirect coverage changes

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[btbest]

Looks like everything runs, and some neat improvements in the tests 👍

[k-dominik]

thank you for the review @btbest !