Bump mesh revision to 4

compass/ocean/tests/global_ocean/mesh/so12to30/so12to30.cfg

@@ -59,7 +59,7 @@ mesh_description = MPAS Southern Ocean regionally refined mesh for E3SM version
 e3sm_version = 3
 # The revision number of the mesh, which should be incremented each time the
 # mesh is revised
-mesh_revision = 3
+mesh_revision = 4
 # the minimum (finest) resolution in the mesh
 min_res = 12
 # the maximum (coarsest) resolution in the mesh, can be the same as min_res