Emoji: Upgrade Twemoji to 12.1.3.

This point release does not add any images and only slightly modifies a few images without changing their meanings. Because of this, the same CDN location can be used and has been updated.

Props matstars, desrosj, Otto42, pento.
Fixes #48293.
Built from https://develop.svn.wordpress.org/trunk@46665


git-svn-id: https://core.svn.wordpress.org/trunk@46465 1a063a9b-81f0-0310-95a4-ce76da25c4cd