fix: setting `no-unused-keys` to `error` breaks `next`

[dargmuesli]

Tell us about your environment

• ESLint version: 9.0.0
• eslint-plugin-vue version: 9.24.1
• eslint-plugin-vue-i18n version: 3.0.0-next.9
• Node version: 20.11.1

Please show your full configuration:

export default [
  ...vueI18n.configs['flat/recommended'],
  {
    rules: {
      '@intlify/vue-i18n/no-unused-keys': 'error', // for all other rules this works fine!
    },
]

What did you do?
Run eslint

What did you expect to happen?
No error to be reported

What actually happened?

Oops! Something went wrong! :(

ESLint: 9.0.0

ESLint couldn't find a configuration file. To set up a configuration file for this project, please run:

    npm init @eslint/config

ESLint looked for configuration files in /[...project]/src and its ancestors. If it found none, it then looked in your home directory.

If you think you already have a configuration file or if you need more help, please stop by the ESLint Discord server: https://eslint.org/chat

 ELIFECYCLE  Command failed with exit code 2.

Repository to reproduce this issue

See second commit in dargmuesli/vio#173, adding the rule configuration (CI run)

[dargmuesli]

Thank you for the quick fix! ❤️ Great to see all of you on here again 😉 greetings!