chore(deps): bump pmndrs/docs/.github/workflows/build.yml from 2 to 3 (#3364)

Bumps [pmndrs/docs/.github/workflows/build.yml](https://github.com/pmndrs/docs) from 2 to 3.
- [Release notes](https://github.com/pmndrs/docs/releases)
- [Changelog](https://github.com/pmndrs/docs/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pmndrs/docs/compare/v2...v3)

---
updated-dependencies:
- dependency-name: pmndrs/docs/.github/workflows/build.yml
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: Daishi Kato <dai-shi@users.noreply.github.com>