Sort dependencies to avoid changes on regen

Seems like the set has different orders when running
the generate script multiple times
this causes all game message class files to change

scripts/generate_messages.py

@@ -276,7 +276,7 @@ def get_dependencies(msg: NetMessageJson) -> str:
     if len(packer_deps) == 0:
         return ''
     return 'from twnet_parser.packer import ' + \
-        ', '.join(set(packer_deps)) + '\n'
+        ', '.join(sorted(set(packer_deps))) + '\n'
 
 def pack_field(member: NetMessageMemberJson) -> str:
     name: str = name_to_snake(member["name"])