src: remove use of CallOnForegroundThread()

The V8 platform's CallOnForegroundThread() method is deprecated.
This commit replaces its use with GetForegroundTaskRunner()
functionality instead.

PR-URL: https://github.com/nodejs/node/pull/24925


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>