🎨 Fix type annotations for Python 3.7 in _compat

Author: tiangolo

sqlmodel/_compat.py

@@ -392,7 +392,7 @@ def set_fields_set(
     ) -> None:
         object.__setattr__(new_object, "__fields_set__", fields)
 
-    def get_annotations(class_dict: dict[str, Any]) -> dict[str, Any]:
+    def get_annotations(class_dict: Dict[str, Any]) -> Dict[str, Any]:
         return resolve_annotations(  # type: ignore[no-any-return]
             class_dict.get("__annotations__", {}),
             class_dict.get("__module__", None),