Updating Buildkite for Emoji 4.0 🥞

Buildkite has updated its emoji support to include all characters from Unicode 9.0 and Emoji 4.0, allowing users to express themselves more effectively. The update also includes improved support for emoji sequences and diverse family emojis. However, the process of implementing these updates was more complex than anticipated due to the need to retool Buildkite's infrastructure and optimize regular expressions. Ultimately, the team learned that it is often better to let users' devices handle emojis rather than implementing custom handling.