sys.flags: add safe_path for 3.11

python/cpython#31542

Author: JelleZijlstra

stdlib/sys.pyi

@@ -122,6 +122,9 @@ class _flags(_uninstantiable_structseq, _FlagTuple):
     if sys.version_info >= (3, 10):
         @property
         def warn_default_encoding(self) -> int: ...  # undocumented
+    if sys.version_info >= (3, 11):
+        @property
+        def safe_path(self) -> bool: ...
 
 float_info: _float_info