Clean up dendrogram typing

[flying-sheep]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.75%. Comparing base (1650aed) to head (b3fa09b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scanpy/plotting/_anndata.py	93.10%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3249      +/-   ##
==========================================
- Coverage   76.75%   76.75%   -0.01%     
==========================================
  Files         109      109              
  Lines       12551    12556       +5     
==========================================
+ Hits         9634     9637       +3     
- Misses       2917     2919       +2     

Files with missing lines	Coverage Δ
src/scanpy/plotting/_baseplot_class.py	90.30% <100.00%> (ø)
src/scanpy/plotting/_dotplot.py	92.24% <100.00%> (ø)
src/scanpy/plotting/_matrixplot.py	96.70% <100.00%> (ø)
src/scanpy/plotting/_stacked_violin.py	83.90% <100.00%> (ø)
src/scanpy/plotting/_utils.py	56.64% <100.00%> (+0.16%)	⬆️
src/scanpy/plotting/_anndata.py	84.86% <93.10%> (-0.16%)	⬇️