Use PEP 604 syntax wherever possible, part II (#7514)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stdlib/_socket.pyi

@@ -1,7 +1,7 @@
 import sys
 from _typeshed import ReadableBuffer, WriteableBuffer
 from collections.abc import Iterable
-from typing import Any, SupportsInt, Union, overload
+from typing import Any, SupportsInt, overload
 
 if sys.version_info >= (3, 8):
     from typing import SupportsIndex
@@ -15,7 +15,7 @@ _CMSGArg = tuple[int, int, ReadableBuffer]
 
 # Addresses can be either tuples of varying lengths (AF_INET, AF_INET6,
 # AF_NETLINK, AF_TIPC) or strings (AF_UNIX).
-_Address = Union[tuple[Any, ...], str]
+_Address = tuple[Any, ...] | str
 _RetAddress = Any
 # TODO Most methods allow bytes as address objects