cli: don't check for updates to npm when we are updating npm itself

Author: olore

bin/npm-cli.js

@@ -75,6 +75,7 @@
   npm.load(conf, function (er) {
     if (er) return errorHandler(er)
     if (
+      !npm.argv.includes('npm') &&
       npm.config.get('update-notifier') &&
       !unsupported.checkVersion(process.version).unsupported
     ) {