Update typechecking for matplotlib 3.8.1

[jklaise]

No description provided.

[codecov]

Codecov Report

Merging #981 (b869eff) into master (71cc77a) will decrease coverage by 0.10%.
Report is 1 commits behind head on master.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #981      +/-   ##
==========================================
- Coverage   85.23%   85.14%   -0.10%     
==========================================
  Files          74       74              
  Lines        8834     8834              
==========================================
- Hits         7530     7522       -8     
- Misses       1304     1312       +8     

Files	Coverage Δ
alibi/utils/visualization.py	48.10% <100.00%> (ø)

... and 1 file with indirect coverage changes