Pin pytest-qt for python 3.10 to fix pyapp-kit projects tests

[Czaki]

References and relevant issues

pyapp-kit/app-model#258 (comment)
followup #8067

Description

The pytest-qt in version 4.5.0 dropped the support for PySide2. In #8067 I've fixed it on our side, but tests of critical for us pyapp-kit projects are broken. This PR fixes their test that uses https://github.com/pyapp-kit/workflows/blob/main/.github/workflows/test-dependents.yml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.03%. Comparing base (db02d84) to head (c0a85a8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8205      +/-   ##
==========================================
+ Coverage   92.96%   93.03%   +0.07%     
==========================================
  Files         658      658              
  Lines       62604    62604              
==========================================
+ Hits        58201    58245      +44     
+ Misses       4403     4359      -44     

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