Dependency cleanup & new colormap updating

[jluethi]

Closes #32
Closes #41

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 93.30%. Comparing base (9e8520b) to head (73d558b).
Report is 1 commits behind head on main.

❗ Current head 73d558b differs from pull request most recent head c6795fe. Consider uploading reports for the commit c6795fe to get more accurate results

Files	Patch %	Lines
src/napari_feature_classifier/annotator_widget.py	25.00%	3 Missing ⚠️
src/napari_feature_classifier/utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   93.39%   93.30%   -0.10%     
==========================================
  Files          11       11              
  Lines         818      821       +3     
==========================================
+ Hits          764      766       +2     
- Misses         54       55       +1     

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[jluethi]

Superseded by #49