Ensure traversal is stable for consistent output (#368)

Author: keirlawson

ariadne_codegen/client_generators/fragments.py

@@ -112,7 +112,7 @@ def visit(name):
             if name in visited:
                 return
             visited.add(name)
-            for dep in dependencies_dict[name]:
+            for dep in sorted(dependencies_dict.get(name, set())):
                 visit(dep)
             sorted_names.append(name)