MAINT: add more pytest.approx calls

[cjwatson]

These tests failed on Debian i386, probably due to x87 excess precision: https://bugs.debian.org/1103140

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.2%. Comparing base (4037c70) to head (ed03a44).
Report is 111 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #698     +/-   ##
=======================================
+ Coverage   97.4%   98.2%   +0.8%     
=======================================
  Files         26      40     +14     
  Lines       4328    7164   +2836     
=======================================
+ Hits        4214    7033   +2819     
- Misses       114     131     +17     

Files with missing lines	Coverage Δ
momepy/tests/test_dimension.py	100.0% <100.0%> (ø)
momepy/tests/test_intensity.py	100.0% <100.0%> (ø)

... and 1 file with indirect coverage changes

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[martinfleis]

@cjwatson do you need a release?

[cjwatson]

I think we can just cherry-pick that patch. No urgency about a release unless you were planning on doing one anyway.