Dep update 2026 4

[k-dominik]

Finally going towards qt6 via pyside6, python 3.13

Notes:

• Needed to fiddle around with image conversion (qimage2ndarray, QImage to numpy). Doing it manually resulted in reproducible results. Flaky using the library - not easy to construct a repro though - seems to require multiple tests in sequence.

Todos:

• open issue about updating the ilastik env in tests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.17%. Comparing base (15e9d32) to head (f941690).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #353   +/-   ##
=======================================
  Coverage   41.17%   41.17%           
=======================================
  Files         109      109           
  Lines       11514    11514           
=======================================
  Hits         4741     4741           
  Misses       6773     6773           

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