Test failure on node v4

[nfischer]

This appears to be a Mac-only failure: https://github.com/nfischer/shelljs-plugin-sleep/actions/runs/7125313387/job/19401029921?pr=19

  1) plugin-sleep
npm ERR! npm  v2.15.11
       fallback methods
npm ERR! code ELIFECYCLE
         can rely on execSync + helper script:
npm ERR! shelljs-plugin-sleep@0.2.2 test-without-lint: `mocha`
     Error: Timeout of 2000ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves. (/Users/runner/work/shelljs-plugin-sleep/shelljs-plugin-sleep/test/test.js)
npm ERR! Exit status 1