First try to import Self from typing

Author: tobiasdiez

src/sage/repl/rich_output/display_manager.py

@@ -37,7 +37,10 @@
 import warnings
 from typing import Any
 
-from typing_extensions import Self
+try:
+    from typing import Self  # type: ignore (Python >= 3.11)
+except ImportError:
+    from typing_extensions import Self  # type: ignore (Python 3.9, 3.10)
 
 from sage.repl.rich_output.output_basic import (
     OutputAsciiArt,