Fix unhandled promise rejection in socket tests (#112806) (#112819)

Co-authored-by: Rudolf Meijering <skaapgif@gmail.com>

src/core/server/http/router/socket.test.ts

@@ -92,7 +92,7 @@ describe('KibanaSocket', () => {
       });
       const socket = new KibanaSocket(tlsSocket);
 
-      expect(socket.renegotiate({})).resolves.toBe(result);
+      await expect(socket.renegotiate({})).rejects.toBe(result);
       expect(spy).toBeCalledTimes(1);
     });