ESLint 9 is released, but it looks like eslint-plugin-jsx-a11y does not yet support it.

There are breaking API changes: https://eslint.org/docs/latest/use/migrate-to-9.0.0#breaking-changes-for-plugin-developers

There is also a new default config format ("flat config") that probably also needs some adjustment in the exported recommended rules; though, support for flat config could be considered a separate issue.