Upgrade CI dependencies

[jarrodmillman]

No description provided.

[codecov-commenter]

Codecov Report

Merging #406 (fd108b2) into main (21226af) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #406      +/-   ##
==========================================
+ Coverage   80.81%   80.87%   +0.06%     
==========================================
  Files           5        5              
  Lines        1251     1255       +4     
==========================================
+ Hits         1011     1015       +4     
  Misses        240      240              

Impacted Files	Coverage Δ
pygraphviz/agraph.py	81.31% <0.00%> (+0.07%)	⬆️

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