build(deps): bump pug from 3.0.2 to 3.0.3 in /docs

Bumps [pug](https://github.com/pugjs/pug) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/[email protected]@3.0.3)

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

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