LibWeb: Enable in Windows CI

Author: https://github.com/ayeteadoe
Commit: dbba6c0df9
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5215
Reviewed-by: https://github.com/ADKaster ✅

Libraries/LibIPC/TransportSocketWindows.h

@@ -24,6 +24,7 @@ public:
     void set_up_read_hook(Function<void()>);
     bool is_open() const;
     void close();
+    void close_after_sending_all_pending_messages();
 
     void wait_until_readable();