Minor fixes for installation with pyside6

[codecov-commenter]

Codecov Report

Merging #42 (8b51724) into main (51d1b56) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   10.41%   10.41%           
=======================================
  Files           7        7           
  Lines         951      951           
=======================================
  Hits           99       99           
  Misses        852      852           

Impacted Files	Coverage Δ
src/napari_deeplabcut/_writer.py	17.07% <100.00%> (ø)

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[deprecated-napari-hub-preview-bot[bot]]

Preview page for your plugin is ready here: https://preview.napari-hub.org/DeepLabCut/napari-deeplabcut/42 Created: 2022-10-21T22:34:28.439374