Bump react-icons from 4.4.0 to 4.12.0 in /docs

Bumps [react-icons](https://github.com/react-icons/react-icons) from 4.4.0 to 4.12.0.
- [Release notes](https://github.com/react-icons/react-icons/releases)
- [Commits](react-icons/react-icons@v4.4.0...v4.12.0)

---
updated-dependencies:
- dependency-name: react-icons
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>