Low priority, but let's change the iono.py interpolation code so we get rid of the DeprecationWarning
$ pytest
tests/test_ionex.py::test_get_ionex_value
/Users/staniewi/repos/COMPASS/src/compass/utils/iono.py:156: DeprecationWarning: `interp2d` is deprecated!
`interp2d` is deprecated in SciPy 1.10 and will be removed in SciPy 1.12.0.
For legacy code, nearly bug-for-bug compatible replacements are
`RectBivariateSpline` on regular grids, and `bisplrep`/`bisplev` for
scattered 2D data.
In new code, for regular grids use `RegularGridInterpolator` instead.
For scattered data, prefer `LinearNDInterpolator` or
`CloughTocher2DInterpolator`.
For more details see
`https://gist.github.com/ev-br/8544371b40f414b7eaf3fe6217209bff`
tec_val = interpolate.interp2d(