Upgrade to node-fetch version 3

[pdavies011010]

There are some breaking changes between node-fetch version 2 and 3 so this will require putting some thought into how to do this upgrade without breaking backward compatiblity for people who are overriding the fetch function using node-fetch v2.

https://github.com/node-fetch/node-fetch/blob/main/docs/v3-UPGRADE-GUIDE.md