deps: upgrade npm to 6.14.7

PR-URL: #34468
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruy Adorno <ruyadorno@github.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Shelley Vohr <codebytere@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: claudiahdz

deps/npm/AUTHORS

@@ -699,3 +699,6 @@ Peter Fich <peterfich@users.noreply.github.com>
 Maxwell Gerber <mgerber@berkeley.edu>
 Sean Poulter <sean.poulter@gmail.com>
 vanishcode <vanishcode@outlook.com>
+Jean-Charles Sisk <jasisk@gmail.com>
+Martin Packman <martin@zegami.com>
+Danielle Adams <danielle.adams@heroku.com>