Migrate code to work in python 3.10

shrimpgrad/device.py

@@ -2,7 +2,7 @@
 from __future__ import annotations
 import ctypes
 from dataclasses import dataclass
-from typing import Optional, Type
+from typing import Type
 from shrimpgrad.dtype import ConstType, DType, to_numpy
 from shrimpgrad.meta.singleton import Singleton
 from shrimpgrad.view import ViewTracker

shrimpgrad/symbolic.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 from enum import Enum, auto
-from typing import Optional, Tuple, TypeAlias
+from typing import Optional, Tuple
 from dataclasses import dataclass
 
 @dataclass