[upgrade]: incompatible with react 19

`freecodecamp/ui@3.1.0` is not compatible with React 19. This breaks the upgrade for https://github.com/freeCodeCamp/exam-env .

I am not sure what is breaking, because the only error is:

```bash
Uncaught TypeError: Cannot read properties of undefined (reading 'ReactCurrentOwner')
    at react-jsx-runtime.production.min.js:9:245
```