Bump debug, compression, express and serve-index in /frontend

Bumps [debug](https://github.com/debug-js/debug), [compression](https://github.com/expressjs/compression), [express](https://github.com/expressjs/express) and [serve-index](https://github.com/expressjs/serve-index). These dependencies needed to be updated together.

Updates `debug` from 2.6.8 to 2.6.9
- [Release notes](https://github.com/debug-js/debug/releases)
- [Changelog](https://github.com/debug-js/debug/blob/2.6.9/CHANGELOG.md)
- [Commits](debug-js/debug@2.6.8...2.6.9)

Updates `compression` from 1.6.2 to 1.7.4
- [Release notes](https://github.com/expressjs/compression/releases)
- [Changelog](https://github.com/expressjs/compression/blob/master/HISTORY.md)
- [Commits](expressjs/compression@1.6.2...1.7.4)

Updates `express` from 4.15.3 to 4.18.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/master/History.md)
- [Commits](expressjs/express@4.15.3...4.18.2)

Updates `serve-index` from 1.9.0 to 1.9.1
- [Release notes](https://github.com/expressjs/serve-index/releases)
- [Changelog](https://github.com/expressjs/serve-index/blob/master/HISTORY.md)
- [Commits](expressjs/serve-index@v1.9.0...v1.9.1)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: indirect
- dependency-name: compression
  dependency-type: indirect
- dependency-name: express
  dependency-type: indirect
- dependency-name: serve-index
  dependency-type: indirect
...

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

Author: dependabot[bot]