src: remove unused using declarations

This commit removes the unused using declarations reported by lint-cpp.

PR-URL: https://github.com/nodejs/node/pull/33268
Refs: https://github.com/nodejs/node/issues/29226


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Christian Clauss <cclauss@me.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>