How to change the CDN

[dominictobias]

jsdelivr went down in Asia today jsdelivr/jsdelivr#18565 causing a lot of problems (cannot run pod commands on Flutter and React Native projects which depend on a lot of widely used modules like Firebase and Auth0)

There are easy fixes if we can change the CDN to e.g. fastly.jsdelivr.net but this repo doesn't explain how we can do that?

Adding source "https://cdn.cocoapods.org/" to Podfile has no affect