bugfix: fix window.fetch
Fixes the issue of the lib by updating it to the last version: https://github.com/inrupt/solid-client-authn-js/issues/944#issuecomment-842262770
Fixes the issue of the lib by updating it to the last version: https://github.com/inrupt/solid-client-authn-js/issues/944#issuecomment-842262770