deps: manually add 10.x support to npm

Currently npm explicitly doesn't support 10.x and will fail on master.
This patch manually adds support for 10.x so that we can keep an up to
date version of npm on master.

refs: nodejs#17535
Backport-PR-URL: nodejs#19560
PR-URL: nodejs#17777
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

deps/npm/lib/utils/unsupported.js

@@ -5,7 +5,8 @@ var supportedNode = [
   {ver: '6', min: '6.0.0'},
   {ver: '7', min: '7.0.0'},
   {ver: '8', min: '8.0.0'},
-  {ver: '9', min: '9.0.0'}
+  {ver: '9', min: '9.0.0'},
+  {ver: '10', min: '10.0.0'}
 ]
 var knownBroken = '<4.7.0'