Remove unnecessary optimizeFonts key from type (#24563)
Remove unnecessary optimizeFonts key from type (#24563)

https://github.com/vercel/next.js/pull/21676 moved `fontOptimization` out of the experimental key of `NextConfig` to the top level, so it should be removed from the type

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.

## Documentation / Examples

- [ ] Make sure the linting passes

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