add future

Author: Kludex

instrumentation/opentelemetry-instrumentation-requests/src/opentelemetry/instrumentation/requests/__init__.py

@@ -72,6 +72,8 @@ def response_hook(span, request_obj, response)
 ---
 """
 
+from __future__ import annotations
+
 import functools
 import types
 from timeit import default_timer