Vulnerability in deps.

[JeanMeche]

Hi, I have the following deps in my project,

├─┬ firebase-tools@12.4.0
│ └─┬ proxy-agent@5.0.0
│   └─┬ pac-proxy-agent@5.0.0
│     └─┬ pac-resolver@5.0.1
│       └─┬ degenerator@3.0.4
│         └── vm2@3.9.19

vm2 is subject to a critical vulnerability.
proxy-agent has been updated, 6.3.0 contains the fix.