bump oldest dependency versions as per spec000 – 2025-10

[jGaboardi]

• bump oldest dependency versions as per spec000 – 2025-10 (#715)
• small doc fix
• this should also get tests passing in #686

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.3%. Comparing base (4037c70) to head (47457d5).
⚠️ Report is 123 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #717     +/-   ##
=======================================
+ Coverage   97.4%   98.3%   +0.9%     
=======================================
  Files         26      26             
  Lines       4328    4195    -133     
=======================================
- Hits        4214    4123     -91     
+ Misses       114      72     -42     

Files with missing lines	Coverage Δ
momepy/diversity.py	97.6% <ø> (-0.8%)	⬇️
momepy/elements.py	97.9% <100.0%> (+1.0%)	⬆️
momepy/tests/test_diversity.py	100.0% <ø> (ø)
momepy/tests/test_intensity.py	100.0% <ø> (ø)

... and 3 files with indirect coverage changes

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