Fix a couple of docs building issues

Author: adamtheturtle

src/mock_vws/_query_tools.py

@@ -2,6 +2,8 @@
 Tools for making Vuforia queries.
 """
 
+from __future__ import annotations
+
 import base64
 import cgi
 import datetime

src/mock_vws/_requests_mock_server/mock_web_query_api.py

@@ -5,6 +5,8 @@
 https://library.vuforia.com/articles/Solution/How-To-Perform-an-Image-Recognition-Query
 """
 
+from __future__ import annotations
+
 import email.utils
 from typing import Callable, Set