Update to Unicode 15.1 emojis from tanuki_emoji gem

What does this MR do and why?

Updates to the latest tanuki_emoji gem and updates the emoji assets

Support for Unicode 15.1 emojis

Related to #493945 and gitlab-org/ruby/gems/tanuki_emoji#15

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Note that the emojis appear a little smaller in after because they were taken in Chrome - the before was taken in Safari

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.