Fix typecheck for 3.7

Author: 7x11x13

scdl/scdl.py

@@ -285,9 +285,9 @@ def __enter__(self):
 
     def __exit__(
         self,
-        exc_type: type[BaseException] | None,
-        exc_value: BaseException | None,
-        traceback: TracebackType | None,
+        exc_type: Optional[type[BaseException]],
+        exc_value: Optional[BaseException],
+        traceback: Optional[TracebackType],
     ) -> None:
         if self._using_soft_lock:
             self._soft_lock.release()