Fix deprecations; support geographic coordinates; add some type hinting/formatting

[dluks]

I've added some general updates to bring spacv a bit more into alignment with its dependencies, as well as added a few bugfixes and quality-of-life improvements.

• Fixes #4 (deprecated shapely syntax)
• Fixes deprecated numpy typing
• Fixes error when zero buffer is provided (similar to #5, and in fact I think I like their solution a bit better)
• Adds support for geographic coordinates
• Fixes semivariance indexing bug that prevented curve_fit from fitting
• Adds some black formatting for consistency
• Adds some type hinting
• Fixes deprecated geopandas sjoin param usage
• Only calculates autocorrelation ranges for a maximum of 30,000 points to prevent memory overflows for large datasets
• Fixes pygeos install issue for python 3.12 by removing it from dependencies since pygeos was merged into Shapely.