fix(types): update resizeTo ref type

[RJWadley]

Description of change

Updates type signature of resizeTo on Application for react 19 compatability

In react 19 useRef requires an argument and the type signature has changed slightly. It's a bit more strict by default, so the type needs to be manually widened in order to work for common use cases like the one in the docs:

import { Application } from '@pixi/react'
import { useRef } from 'react'
const MyComponent = () => {
  const parentRef = useRef<HTMLDivElement>(null) // <- returns RefObject<HTMLDivElement | null>
  return (
    <div ref={parentRef}>
      <Application resizeTo={parentRef} /> 
      {/* ^ will throw an error if we ask for RefObject<HTMLElement> - null is not assignable to element */}
    </div>
  )
}

Pre-Merge Checklist

• Tests and/or benchmarks are included N/A
• Documentation is changed or added N/A
• Lint process passed (npm run lint)
• Tests passed (npm run test)

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[trezy]

This looks great. Thanks for the PR! ❤️

[github-actions]

🎉 This PR is included in version 8.0.0-beta.21 🎉

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