Bump http-proxy in /grr/server/grr_response_server/gui/static

Bumps [http-proxy](https://github.com/http-party/node-http-proxy) from 1.18.0 to 1.18.1.
- [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](http-party/node-http-proxy@1.18.0...1.18.1)

---
updated-dependencies:
- dependency-name: http-proxy
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>