Update Expo domain to expo.dev (#34799)

Summary:
Some time ago, we moved the Expo domain over to `expo.dev` ([see this PR for example](https://github.com/expo/expo/commit/c5e091a0155d138abdb24283d92c84816e5a1c09)). This does the same thing here :)

## Changelog

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Internal Changed - Update Expo domain to expo.dev

Pull Request resolved: https://github.com/facebook/react-native/pull/34799

Test Plan: Just a minor change, unrelated to React Native code.

Reviewed By: lunaleaps

Differential Revision: D39867749

Pulled By: lunaleaps

fbshipit-source-id: f6ad6350d991ffe1ef8310415e28ae49ed776afc