Big diff: Use new "|" union syntax (#5872)

stdlib/sre_constants.pyi

@@ -1,15 +1,15 @@
 import sys
-from typing import Any, Dict, List, Optional, Union
+from typing import Any, Dict, List
 
 MAGIC: int
 
 class error(Exception):
     msg: str
-    pattern: Optional[Union[str, bytes]]
-    pos: Optional[int]
+    pattern: str | bytes | None
+    pos: int | None
     lineno: int
     colno: int
-    def __init__(self, msg: str, pattern: Optional[Union[str, bytes]] = ..., pos: Optional[int] = ...) -> None: ...
+    def __init__(self, msg: str, pattern: str | bytes | None = ..., pos: int | None = ...) -> None: ...
 
 class _NamedIntConstant(int):
     name: Any