cliOptions.flags is ignored

```javascript
//  jest-runner-eslint.config.js
module.exports = {
  cliOptions: {
    quiet: true,
    cache: false,
    flags: ['unstable_config_lookup_from_file'],
  },
};
``` 

The **flags** option is not being taken into account, 
Can someone take a look into this ?

> Happy to raise a PR to fix this