build: update macos deployment target to 10.13 for 14.x

Update the macos deployment target to 10.13 (High Sierra) for Node 14

refs: https://github.com/nodejs/build/issues/2168

PR-URL: https://github.com/nodejs/node/pull/32454
Refs: https://github.com/nodejs/build/issues/2168


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: James M Snell <jasnell@gmail.com>