[Security] Security warning for outdated superagent in the API client

[eatyourgreens]

Building with this client generates the following security warning:

superagent@8.1.2: Please upgrade to v9.0.0+ as we have fixed a public vulnerability with formidable dependency. Note that v9.0.0+ requires Node.js v14.18.0+. See ladjs/superagent#1800 for insight. This project is supported and maintained by the team at Forward Email @ https://forwardemail.net

[eatyourgreens]

NB. The current version of Superagent is 10.1.
https://github.com/ladjs/superagent/releases/tag/v10.1.0

PJC is still using version 8.