Use `sample_points()` from geopandas

[kadyb]

Replace our own function with the built in version 0.13

https://github.com/kadyb/vector-benchmark/blob/main/geopandas/sample.py

[martinfleis]

Agree, but it should not make a lot of difference as what I wrote initially for this benchmark made its way to geopandas, so the implementation is nearly the same.

[kadyb]

Yeah, I think the main advantage will be that the user will be able to see the exact equivalent of the function from sf and terra.