tests: replace mock methods removed in Py3.12

[lengau]

Mock.called_with was never actually a real mock method in unittest.mock. It was returning a Mock object, which is truthy.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.34%. Comparing base (c44101e) to head (7d5564d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4640      +/-   ##
==========================================
- Coverage   89.16%   88.34%   -0.83%     
==========================================
  Files         343      327      -16     
  Lines       23883    21966    -1917     
==========================================
- Hits        21295    19405    -1890     
+ Misses       2588     2561      -27     

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