Support for geopandas >=1.0.0

[amillb]

geopandas 1.0.0 removed the previously deprecated parameter op parameter in sjoin. Rather than op, predicate should now be used.

This means that from_county() in cenpy now throws an error. For example:

products.ACS(2017).from_county('Riverside, CA', level='tract', variables='B25035_001E')

TypeError: sjoin() got an unexpected keyword argument 'op'

I think this is simple to fix through replacing op= with predicate= in cenpy.products().

[knaaptime]

hey, thanks for this. Apologies, the team is spread extremely thin and hasn't had much time for maintenance in awhile. You're right, that should probably do it. If you're up for a PR we can get it merged.

we also need to migrate the tests over to github actions to get things running again