Update gamic_hdf5.py

[arthurcts]

Gamic unfolding extend to 5./6. , 6./7.
This change is required to read data from the GMWR1000SST radar model.

[zssherman]

Thanks for the PR! We will test and review this soon

[zssherman]

@arthurcts Apologies, after discussion, we are encouraging folks to move to xradar for reading gamic files. Could you try:

import xradar as xd

import pyart
from pyart.testing import get_test_data

# Locate the test data and read in using xradar
tree = xd.io.open_gamic_datatree([filename])
# Give the tree Py-ART radar methods
radar = tree.pyart.to_radar()

And see if that works with the new radar model?