Improve netrc types on py311+ (#9376)

Author: Dreamsorcerer

stdlib/netrc.pyi

@@ -1,3 +1,4 @@
+import sys
 from _typeshed import StrOrBytesPath
 from typing_extensions import TypeAlias
 
@@ -10,7 +11,10 @@ class NetrcParseError(Exception):
     def __init__(self, msg: str, filename: StrOrBytesPath | None = ..., lineno: int | None = ...) -> None: ...
 
 # (login, account, password) tuple
-_NetrcTuple: TypeAlias = tuple[str, str | None, str | None]
+if sys.version_info >= (3, 11):
+    _NetrcTuple: TypeAlias = tuple[str, str, str]
+else:
+    _NetrcTuple: TypeAlias = tuple[str, str | None, str | None]
 
 class netrc:
     hosts: dict[str, _NetrcTuple]