Bump debug, compression, express, serve-index, karma and phantomjs-pr…

…ebuilt

Bumps [debug](https://github.com/debug-js/debug) to 2.6.9 and updates ancestor dependencies [debug](https://github.com/debug-js/debug), [compression](https://github.com/expressjs/compression), [express](https://github.com/expressjs/express), [serve-index](https://github.com/expressjs/serve-index), [karma](https://github.com/karma-runner/karma) and [phantomjs-prebuilt](https://github.com/Medium/phantomjs). These dependencies need to be updated together.


Updates `debug` from 0.7.4 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@0.7.4...2.6.9)

Updates `compression` from 1.7.0 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@1.7.0...1.7.4)

Updates `express` from 4.15.4 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@4.15.4...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)

Updates `karma` from 0.13.22 to 6.4.1
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v0.13.22...v6.4.1)

Updates `phantomjs-prebuilt` from 2.1.14 to 2.1.16
- [Release notes](https://github.com/Medium/phantomjs/releases)
- [Commits](https://github.com/Medium/phantomjs/commits)

---
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
- dependency-name: karma
  dependency-type: direct:development
- dependency-name: phantomjs-prebuilt
  dependency-type: direct:development
...

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