fixed import error

I had an
ImportError: cannot import name 'Protocol' from 'typing'
while trying to update so I fixed it to start an app

comfy/ldm/modules/sub_quadratic_attention.py

@@ -14,7 +14,12 @@ import torch
 from torch import Tensor
 from torch.utils.checkpoint import checkpoint
 import math
-from typing import Optional, NamedTuple, Protocol, List
+
+try:
+	from typing import Optional, NamedTuple, List, Protocol
+except ImportError:
+	from typing import Optional, NamedTuple, List
+	from typing_extensions import Protocol
 
 from torch import Tensor
 from typing import List

main.py

@@ -11,6 +11,7 @@ if os.name == "nt":
 import execution
 import server
 
+
 if __name__ == "__main__":
     if '--help' in sys.argv:
         print("Valid Command line Arguments:")