Switch to PEP-604 syntax in python2 stubs (#5915)

Signed-off-by: oleg.hoefling <oleg.hoefling@gmail.com>

stdlib/@python2/SocketServer.pyi

@@ -1,6 +1,6 @@
 import sys
 from socket import SocketType
-from typing import Any, BinaryIO, Callable, ClassVar, List, Optional, Text, Tuple, Union
+from typing import Any, BinaryIO, Callable, ClassVar, List, Text, Tuple, Union
 
 class BaseServer:
     address_family: int
@@ -10,7 +10,7 @@ class BaseServer:
     allow_reuse_address: bool
     request_queue_size: int
     socket_type: int
-    timeout: Optional[float]
+    timeout: float | None
     def __init__(self, server_address: Any, RequestHandlerClass: Callable[..., BaseRequestHandler]) -> None: ...
     def fileno(self) -> int: ...
     def handle_request(self) -> None: ...
@@ -46,22 +46,22 @@ if sys.platform != "win32":
     class UnixStreamServer(BaseServer):
         def __init__(
             self,
-            server_address: Union[Text, bytes],
+            server_address: Text | bytes,
             RequestHandlerClass: Callable[..., BaseRequestHandler],
             bind_and_activate: bool = ...,
         ) -> None: ...
     class UnixDatagramServer(BaseServer):
         def __init__(
             self,
-            server_address: Union[Text, bytes],
+            server_address: Text | bytes,
             RequestHandlerClass: Callable[..., BaseRequestHandler],
             bind_and_activate: bool = ...,
         ) -> None: ...
 
 if sys.platform != "win32":
     class ForkingMixIn:
-        timeout: Optional[float]  # undocumented
-        active_children: Optional[List[int]]  # undocumented
+        timeout: float | None  # undocumented
+        active_children: List[int] | None  # undocumented
         max_children: int  # undocumented
         def collect_children(self) -> None: ...  # undocumented
         def handle_timeout(self) -> None: ...  # undocumented
@@ -101,7 +101,7 @@ class BaseRequestHandler:
 class StreamRequestHandler(BaseRequestHandler):
     rbufsize: ClassVar[int]  # undocumented
     wbufsize: ClassVar[int]  # undocumented
-    timeout: ClassVar[Optional[float]]  # undocumented
+    timeout: ClassVar[float | None]  # undocumented
     disable_nagle_algorithm: ClassVar[bool]  # undocumented
     connection: SocketType  # undocumented
     rfile: BinaryIO