`@docusaurus/eslint-plugin` is not compatible with ESLint 9

### Have you read the Contributing Guidelines on issues?

- [X] I have read the [Contributing Guidelines on issues](https://github.com/facebook/docusaurus/blob/main/CONTRIBUTING.md#issues).

### Description

See this dependency: https://github.com/facebook/docusaurus/blob/main/packages/eslint-plugin/package.json#L24

This needs to be upgraded to max, or else satisfying the peer deps is impossible on ESLint 9.

- [ ] I'd be willing to fix this bug myself.