title: Cannot find module 'agentkeepalive' when updating NPM to 7.20.3
body: <p>When I'm trying to update npm to <strong>7.20.3</strong> (<code>npm install -g npm@7.20.3</code>), npm throws :</p>
  <pre><code>npm ERR! code MODULE_NOT_FOUND
  npm ERR! Cannot find module 'agentkeepalive'
  npm ERR! Require stack:
  npm ERR! - /Users/ShaggyRogers/.nvm/versions/node/v14.16.0/lib/node_modules/npm/node_modules/make-fetch-happen/agent.js
  ...
  </code></pre>