Fix an unnecessary socketserver allowlist entry (#9777)

Author: AlexWaygood

stdlib/socketserver.pyi

@@ -42,14 +42,10 @@ class BaseServer:
     request_queue_size: int
     socket_type: int
     timeout: float | None
+    RequestHandlerClass: Callable[[Any, _RetAddress, Self], BaseRequestHandler]
     def __init__(
         self, server_address: _Address, RequestHandlerClass: Callable[[Any, _RetAddress, Self], BaseRequestHandler]
     ) -> None: ...
-    # It is not actually a `@property`, but we need a `Self` type:
-    @property
-    def RequestHandlerClass(self) -> Callable[[Any, _RetAddress, Self], BaseRequestHandler]: ...
-    @RequestHandlerClass.setter
-    def RequestHandlerClass(self, val: Callable[[Any, _RetAddress, Self], BaseRequestHandler]) -> None: ...
     def fileno(self) -> int: ...
     def handle_request(self) -> None: ...
     def serve_forever(self, poll_interval: float = 0.5) -> None: ...

tests/stubtest_allowlists/py3_common.txt

@@ -165,7 +165,6 @@ pyexpat.expat_CAPI
 select.poll  # Depends on configuration
 selectors.DevpollSelector  # Depends on configuration
 shutil.rmtree  # stubtest doesn't like that we have this as an instance of a callback protocol instead of a function
-socketserver.BaseServer.RequestHandlerClass  # is defined as a property, because we need `Self` type
 socketserver.BaseServer.fileno  # implemented in derived classes
 socketserver.BaseServer.get_request  # implemented in derived classes
 socketserver.BaseServer.server_bind  # implemented in derived classes