Fix type signatures on numba guvectorize decorator #43
Description
The type info currently there doesn't make much sense: https://github.com/arviz-devs/xarray-einstats/blob/main/src/xarray_einstats/numba.py#L13-L22
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The type info currently there doesn't make much sense: https://github.com/arviz-devs/xarray-einstats/blob/main/src/xarray_einstats/numba.py#L13-L22