Use TypeAlias where possible for type aliases (#7630)

stdlib/uuid.pyi

@@ -1,9 +1,10 @@
 import sys
+from typing_extensions import TypeAlias
 
 # Because UUID has properties called int and bytes we need to rename these temporarily.
-_Int = int
-_Bytes = bytes
-_FieldsType = tuple[int, int, int, int, int, int]
+_Int: TypeAlias = int
+_Bytes: TypeAlias = bytes
+_FieldsType: TypeAlias = tuple[int, int, int, int, int, int]
 
 if sys.version_info >= (3, 7):
     from enum import Enum