Revert import of Literal

Author: YuriiMotov

sqlmodel/_compat.py

@@ -1,4 +1,3 @@
-import sys
 import types
 from contextlib import contextmanager
 from contextvars import ContextVar
@@ -22,7 +21,7 @@
 from pydantic import VERSION as P_VERSION
 from pydantic import BaseModel
 from pydantic.fields import FieldInfo
-from typing_extensions import Annotated, get_args, get_origin
+from typing_extensions import Annotated, Literal, get_args, get_origin
 
 # Reassign variable to make it reexported for mypy
 PYDANTIC_VERSION = P_VERSION
@@ -63,12 +62,6 @@ def _is_union_type(t: Any) -> bool:
     return t is UnionType or t is Union
 
 
-if sys.version_info >= (3, 9):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
-
 finish_init: ContextVar[bool] = ContextVar("finish_init", default=True)