Binary mode for file deserialization in python (#6936)

* use wb mode in file deserialization

* add auto generated files from security/python-petstore.sh

samples/client/petstore/python-asyncio/petstore_api/api_client.py

@@ -525,7 +525,7 @@ class ApiClient(object):
                                  content_disposition).group(1)
             path = os.path.join(os.path.dirname(path), filename)
 
-        with open(path, "w") as f:
+        with open(path, "wb") as f:
             f.write(response.data)
 
         return path