deps: update npm to 6.14.3

PR-URL: https://github.com/nodejs/node/pull/32368
Refs: https://github.com/nodejs/node/issues/32296


Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>