COMPAT: compatibility with numpy

[martinfleis]

This should fix compatibility with the latest numpy. This should be released ASAP as pointpats is now defunct in fresh environments (see our CI).

there's also a bit of auto-linting, sorry for that

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 69.9%. Comparing base (4ecafc6) to head (d9fa804).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pointpats/pointpattern.py	66.7%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #147     +/-   ##
=======================================
+ Coverage   69.7%   69.9%   +0.2%     
=======================================
  Files         12      12             
  Lines       1775    1785     +10     
=======================================
+ Hits        1237    1247     +10     
  Misses       538     538             

Files with missing lines	Coverage Δ
pointpats/centrography.py	46.2% <ø> (ø)
pointpats/pointpattern.py	69.1% <66.7%> (ø)