title: check all globally installed npm packages with volta
body: <p>I want to check all installed npm packages globally with volta.</p>
  <p>Before volta, I usually used <code>npm-check-updates</code> with the command <code>ncu --global</code>.
  With volta, this does not work anymore.</p>
  <p>What is the best way to check and update all packages installed globally with volta?</p>