Does not support matplotlib v3.9 (latest stable)

[mnlevy1981]

I created a new CUPiD environment, which had the effect of updating to the latest stable releases of all the python packages. When I run the CUPiD example which relies on mom6-tools, I get

AttributeError                            Traceback (most recent call last)
Cell In[2], line 8
      6 import intake
      7 from mom6_tools.MOM6grid import MOM6grid
----> 8 from mom6_tools.surface import get_MLD, get_BLD
      9 import xarray as xr
     11 warnings.filterwarnings("ignore")

File /glade/work/mlevy/codes/CUPiD/externals/mom6-tools/mom6_tools/surface.py:14
     12 from mom6_tools.DiagsCase import DiagsCase
     13 from mom6_tools.m6toolbox import add_global_attrs
---> 14 from mom6_tools.m6plot import xycompare, xyplot
     15 from mom6_tools.MOM6grid import MOM6grid
     16 from distributed import Client

File /glade/work/mlevy/codes/CUPiD/externals/mom6-tools/mom6_tools/m6plot.py:1871
   1868   return lonRange, latRange, hspace, titleOffset
   1870 # Load new named colormaps
-> 1871 c = dunne_rainbow()
   1872 c = dunne_pm()
   1873 c = brownblue_cmap()

File /glade/work/mlevy/codes/CUPiD/externals/mom6-tools/mom6_tools/m6plot.py:1648, in dunne_rainbow(N)
   1646 cmap.set_under([.95*.9,.75*.9,.9]); cmap.set_over([.3,0.,0.])
   1647 #cmap.set_bad('w')
-> 1648 matplotlib.cm.register_cmap(cmap=cmap)
   1649 return cmap

AttributeError: module 'matplotlib.cm' has no attribute 'register_cmap'

It looks like matplotlib.cm.register_cmap() was removed in v3.9, with the note "Use matplotlib.colormaps.register(name) instead." (I think that's the right link?)

[gustavo-marques]

Thanks, @mnlevy1981. I have a fix for this and will create a PR soon.