Fix for 3.8

Author: Julian

referencing/typing.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Any, Iterable, Protocol, Union
 
 try:
@@ -23,7 +25,7 @@ def name(self) -> str:
 
     def resolve(
         self,
-        dynamic_scope: Iterable[tuple[Schema, "Anchor"]],
+        dynamic_scope: Iterable[tuple[Schema, Anchor]],
         uri: str,
     ) -> tuple[Schema, str]:
         pass