[BG-5474] Upgrade vulnerable node modules
[BG-5474] Upgrade vulnerable node modules

Summary: https://snyk.io/test/npm/bitgo reports 4 vulnerabilities, 2 of which are critical. Upgrades ripple-lib, superagent, and lodash to their latest versions, and removes argparse (unused dependency)

Reviewers: arik, kevin, bigly, zacleids

Reviewed By: zacleids

Subscribers: ben

Differential Revision: https://phabricator.bitgo.com/D8962

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS