Bump vendor/emojis from 167b951 to 8540767

Bumps [vendor/emojis](https://github.com/buildkite/emojis) from `167b951` to `8540767`.
- [Commits](buildkite/emojis@167b951...8540767)

---
updated-dependencies:
- dependency-name: vendor/emojis
  dependency-type: direct:production
...

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