Add backup import of Protocol from typing_extensions

Author: tekktrik

adafruit_requests.py

@@ -50,7 +50,12 @@ def cast(_t, value):
 else:
     from ssl import SSLContext
     from types import ModuleType, TracebackType
-    from typing import Any, Dict, List, Optional, Protocol, Tuple, Type, Union, cast
+    from typing import Any, Dict, List, Optional, Tuple, Type, Union, cast
+
+try:
+    from typing import Protocol
+except ImportError:
+    from typing_extensions import Protocol
 
     # Based on https://github.com/python/typeshed/blob/master/stdlib/_socket.pyi
     class CommonSocketType(Protocol):