fix: close idle gateway http connections

src/gateway/server-close.ts

@@ -107,6 +107,9 @@ export function createGatewayCloseHandler(params: {
       await params.browserControl.stop().catch(() => {});
     }
     await new Promise<void>((resolve) => params.wss.close(() => resolve()));
+    if ("closeIdleConnections" in params.httpServer) {
+      params.httpServer.closeIdleConnections();
+    }
     await new Promise<void>((resolve, reject) =>
       params.httpServer.close((err) => (err ? reject(err) : resolve())),
     );