src: use SealHandleScope for inspector tasks

This addresses a TODO comment that can be resolved,
now that we have V8 7.4.

PR-URL: https://github.com/nodejs/node/pull/27116


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>