errors: remove experimental from --enable-source-maps

PR-URL: https://github.com/nodejs/node/pull/37743


Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Ruy Adorno <ruyadorno@github.com>
Reviewed-By: Ian Sutherland <ian@iansutherland.ca>
Reviewed-By: Rich Trott <rtrott@gmail.com>