use --headless=new argument in chromium

[DetachHead]

the readme states that headed mode is required when using chromium, but this isn't the case if you use the --headless=new argument, as documented here:

const pathToExtension = path.join(__dirname, 'my-extension');
const context = await chromium.launchPersistentContext('', {
  headless: false,
  args: [
    `--headless=new`,
    `--disable-extensions-except=${pathToExtension}`,
    `--load-extension=${pathToExtension}`,
  ],
});