feat!: support eslint@9 and flat config

[AriPerkkio]

• Closes Support ESLint's flat config #389
• Closes chore(deps): update dependency eslint to v9 #512

Breaking changes:

• Minimum requirement for eslint is now v9
• Optional peer dependency for loading Typescript configurations was changed from ts-node. You can now use either jiti or importx.
• eslint-remote-tester.config.js supports now eslintConfig option. Previous eslintrc option was removed.

import js from '@eslint/js';

export default {
    repositories: ['AriPerkkio/eslint-remote-tester-integration-test-target'],
    extensions: ['js', 'jsx', 'ts', 'tsx'],
    eslintConfig: [js.configs.recommended],
};

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eslint-remote-tester (4c7d4e9)

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eslint-remote-tester-repositories (4c7d4e9)

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