repl: remove deprecated repl.memory function

This removes the memory function. It is deprecated for a long time
while not being really helpful being exposed. Thus, it is removed
to improve maintainability of the REPL module.

Signed-off-by: Ruben Bridgewater <ruben@bridgewater.de>

PR-URL: https://github.com/nodejs/node/pull/33286


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>