[Security] Bump https-proxy-agent from 2.2.1 to 2.2.4 in /build

Bumps [https-proxy-agent](https://github.com/TooTallNate/node-https-proxy-agent) from 2.2.1 to 2.2.4. **This update includes security fixes.**
- [Release notes](https://github.com/TooTallNate/node-https-proxy-agent/releases)
- [Commits](https://github.com/TooTallNate/node-https-proxy-agent/compare/2.2.1...2.2.4

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>