Drop python 3.7

The lastest pyproj doesn't support it

Author: xylar

recipes/e3sm-unified/configs/generate.py

@@ -7,7 +7,7 @@
     tempate_test = f.read()
 
 template = Template(tempate_test)
-for python in ['3.7', '3.8', '3.9', '3.10']:
+for python in ['3.8', '3.9', '3.10']:
     for mpi in ['nompi', 'mpich', 'openmpi', 'hpc']:
         script = template.render(python=python, mpi=mpi)
         filename = 'mpi_{}_python{}.yaml'.format(mpi, python)