Verify zombie is not vulnerable to CVE-2021-20066

[johnstacy]

CVE-2021-20066 is a vulnerability in jsdom that will not be fixed. It appears it is up to the users of jsdom to ensure they are not insecurely using it. According to the Red Hat writeup, there are only certain situations where a caller could be vulnerable. Just wanted to confirm that zombie is not using jsdom in an insecure manner.