build(deps): bump debug in /packages/wxa-compiler-stylus

Bumps [debug](https://github.com/debug-js/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)

---
updated-dependencies:
- dependency-name: debug
  dependency-type: indirect
...

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