Bump conda-lock to 2.5.1, add fiona and h5netcdf

[weiji14]

Some dependency updates and additions

• conda-lock 2.4.2 to 2.5.1, which brings alphabetical sorting
• fiona, used to read vector files in sampling script at #29
• h5netcdf, used to write NetCDF4 files in #44

[weiji14]

Merging directly again, so that I can continue work on #37.