[Security] Bump http-proxy from 1.17.0 to 1.18.1 in /build

Bumps [http-proxy](https://github.com/http-party/node-http-proxy) from 1.17.0 to 1.18.1. **This update includes a security fix.**
- [Release notes](https://github.com/http-party/node-http-proxy/releases)
- [Changelog](https://github.com/http-party/node-http-proxy/blob/master/CHANGELOG.md)
- [Commits](https://github.com/http-party/node-http-proxy/compare/1.17.0...1.18.1

)

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