build(deps-dev): bump dotenv from 16.0.1 to 16.0.3 in /docs

Bumps [dotenv](https://github.com/motdotla/dotenv) from 16.0.1 to 16.0.3.
- [Release notes](https://github.com/motdotla/dotenv/releases)
- [Changelog](https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md)
- [Commits](motdotla/dotenv@v16.0.1...v16.0.3)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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