Update Externals file to point directly to branch

Author: mkavulich

Externals.cfg

@@ -11,8 +11,8 @@ required = True
 protocol = git
 repo_url = https://github.com/mkavulich/ufs-weather-model
 # Specify either a branch name or a hash but not both.
-#branch = develop
-hash = 36689db9
+branch = wind_vinterp_and_openmp_updates
+#hash = 36689db9
 local_path = sorc/ufs-weather-model
 required = True