package: upgrade to React v18

[mdonadoni]

React 18 was released in March 2022: https://react.dev/blog/2022/03/29/react-v18

Main features:

• Automatic batching of re-renders
• Transitions (non-urgent updates)
• Improved Suspense feature
• New hooks: useId, useTransition, useDeferredValue, useSyncExternalStore, useInsertionEffect

We should also consider upgrading React-related dependencies at the same time (craco/react-scripts)