Use TypeAlias for type aliases where possible, part II (#7667)

stdlib/poplib.pyi

@@ -1,5 +1,6 @@
 import socket
 import ssl
+from builtins import list as _list  # conflicts with a method named "list"
 from typing import Any, BinaryIO, NoReturn, Pattern, overload
 from typing_extensions import Literal, TypeAlias
 
@@ -16,8 +17,6 @@ LF: Literal[b"\n"]
 CRLF: Literal[b"\r\n"]
 HAVE_SSL: bool
 
-_list = list  # conflicts with a method named "list"
-
 class POP3:
     encoding: str
     host: str