Add chart.js CVE-2020-7746

[Samira]

Retire.js version: (retire --version): 3.2.3

node version: (node --version): 16.13.1

Type:
Feature

Description: Add CVE-2020-7746 as known issue impacting all chart.js before 2.9.4

Expected behaviour: CVE-2020-7746 should be detected when applicable