Don't check for last version

Patch based on https://sources.debian.org/src/npm/7.5.2+ds-2/debian/patches/dont-check-for-last-version.patch

--- a/lib/cli/update-notifier.js
+++ b/lib/cli/update-notifier.js
@@ -76,6 +76,8 @@ const updateCheck = async (npm, spec, version, current) => {
 }
 
 const updateNotifier = async (npm, spec = '*') => {
+  // XXX-Patched: Maintained by Alpine's package manager
+  return null;
   // if we're on a prerelease train, then updates are coming fast
   // check for a new one daily.  otherwise, weekly.
   const { version } = npm