Upgrade react-docgen-typescript-plugin for TS4.8

[shilman]

Closes #19055

What I did

Fixed #21145 in our fork of react-docgen-typescript-plugin. If this works will try to get it merged back into the trunk.

Self-merging @ndelangen

How to test

• CI passes
• Update the cra-ts sandbox Button with:

export default function Button({
  primary = false,
  size = 'medium',
  backgroundColor,
  label,
  ...props
}: ButtonProps) {
  const mode = primary ? 'storybook-button--primary' : 'storybook-button--secondary';
  return (
    <button
      type="button"
      className={['storybook-button', `storybook-button--${size}`, mode].join(' ')}
      style={{ backgroundColor }}
      {...props}
    >
      {label}
    </button>
  );
};