Bump debug and gulp-connect

Bumps [debug](https://github.com/debug-js/debug) to 2.6.9 and updates ancestor dependency [gulp-connect](https://github.com/avevlad/gulp-connect). These dependencies need to be updated together.


Updates `debug` from 2.2.0 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@2.2.0...2.6.9)

Updates `gulp-connect` from 5.0.0 to 5.7.0
- [Release notes](https://github.com/avevlad/gulp-connect/releases)
- [Commits](avevlad/gulp-connect@v5.0.0...5.7.0)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: indirect
- dependency-name: gulp-connect
  dependency-type: direct:development
...

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