doc: fix CJS-ESM selector in Safari

Safari needs a vendor prefix on the appearance of the checkbox.

PR-URL: https://github.com/nodejs/node/pull/40135


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>