chore(deps-dev): bump boardgame.io from 0.47.6 to 0.47.9

Bumps [boardgame.io](https://github.com/boardgameio/boardgame.io) from 0.47.6 to 0.47.9.
- [Release notes](https://github.com/boardgameio/boardgame.io/releases)
- [Commits](boardgameio/boardgame.io@v0.47.6...v0.47.9)

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

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