grib_to_geotiff should detect 3d variable and crash

[jh-206]

Command:

python github/notebooks/fmda/data/grib_to_geotiff.py /home/hirschij/github/wrfxpy/ingest/HRRR/hrrr.20230820/conus/hrrr.t03z.wrfprsf00.grib2 ~/test.tiff 071