COMPAT: fix compatibility with scipy 1.15

[martinfleis]

This should fix the CI errors we are seeing. Probably worth cutting a patch release.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 0.0%. Comparing base (f6fe42d) to head (46114ef).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
tobler/area_weighted/area_interpolate.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #221   +/-   ##
===================================
  Coverage   0.0%   0.0%           
===================================
  Files        13     14    +1     
  Lines       515    532   +17     
===================================
- Misses      515    532   +17     

Files with missing lines	Coverage Δ
tobler/area_weighted/area_interpolate.py	0.0% <0.0%> (ø)

... and 1 file with indirect coverage changes

[knaaptime]

nice. Also ran into a compat issue yesterday where we need to update h3.edge_length with https://uber.github.io/h3-py/api_verbose.html#h3.average_hexagon_edge_length when buffer=True in h3fy