Simple workaround for pyside 6

[Czaki]

I found that recent version of pyside6 overwrite str method of Enum class, so checking if str method belongs either to enum or shibokensupport modules solves this problem.

But I'm not sure if it is a goo d idea as it may impact on some related enums.

Maybe the best option will be to wait on the next PySide6 release? Maybe they will solve it?

fixes: #118

[codecov]

Codecov Report

Merging #119 (bc5f91b) into main (f401d6d) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   84.94%   84.94%           
=======================================
  Files          30       30           
  Lines        2391     2391           
=======================================
  Hits         2031     2031           
  Misses        360      360           

Impacted Files	Coverage Δ
src/superqt/combobox/_enum_combobox.py	93.84% <100.00%> (ø)

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[Czaki]

imageio just released a new version
https://pypi.org/project/imageio/#history

imageio/imageio#887

[tlambert03]

this works fine for me. we can iterate if/when pyside changes in the future. thanks @Czaki!