feat!: support `eslint@9` and flat config

[AriPerkkio]

• Closes https://github.com/AriPerkkio/eslint-remote-tester/issues/389
• Closes https://github.com/AriPerkkio/eslint-remote-tester/pull/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], };

[pkg-pr-new[bot]]

Run & review this pull request in StackBlitz Codeflow.

eslint-remote-tester (4c7d4e9)

npm i https://pkg.pr.new/eslint-remote-tester@519

eslint-remote-tester-repositories (4c7d4e9)

npm i https://pkg.pr.new/eslint-remote-tester-repositories@519