Fixes React v19 incompatibility, increasing React minimum to v18

[lourd]

Description

This library is incompatible with React 19 because it's usage of ReactDOM.render which has been dropped in v19.

I've changed the usage of that to createRoot and increased the required react and react-dom versions to v18.

This will be a new major version as it is a breaking change to all users not on at least v18.

Testing

I tried running the tests but they were failing for me. They were failing before I made any changes with:

`Tooltip` must be used within `TooltipProvider`

After the changes they're failing with:

> Cannot read property 'useRef' of null

I think that means there's multiple versions of React being bundled, but I wasn't able to figure out how to debug that.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 89db3d4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Name	Status	Preview	Comments	Updated (UTC)
leva	❌ Failed (Inspect)			Aug 17, 2024 3:25pm

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leva-minimal	Configuration
leva-busy	Configuration
leva-scroll	Configuration
leva-advanced-panels	Configuration
leva-ui	Configuration
leva-theme	Configuration
leva-transient	Configuration
leva-plugin-plot	Configuration
leva-plugin-bezier	Configuration
leva-plugin-spring	Configuration
leva-plugin-dates	Configuration
leva-custom-plugin	Configuration

[lourd]

cc/ @dbismut @CodyJasonBennett for review