chore(deps): bump proxy-agent from 4.0.0 to 4.0.1 (#2908)

Bumps [proxy-agent](https://github.com/TooTallNate/node-proxy-agent) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/TooTallNate/node-proxy-agent/releases)
- [Changelog](https://github.com/TooTallNate/node-proxy-agent/blob/master/History.md)
- [Commits](https://github.com/TooTallNate/node-proxy-agent/compare/4.0.0...4.0.1)

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