bjects a witness to undue burden within the meaning of [Rule 45(d)(3)(A)(iv)] `depends upon such factors as relevance . . and the burden imposed.'" Garneau v. Paquin, 2015 WL 3466833, at *3 (D. Conn. June I, 2015), quoting In re Application of Operacion y Supervision de Hoteles, S.A., 2015 WL 82007, at