Chat Systems 3.4.2

Upgrading from 3.4.1

• Pull both images and restart api, worker and frontend so all three run 3.4.2; there is no migration.

Fixed

• React with a custom emoji. The emoji picker has a Workspace category with the
  workspace's own emoji, in the composer, on a message and for a workflow's reaction trigger.
  A reaction used to be refused above eight characters, so :party-parrot: could not be one.
  API: POST /messages/{id}/reactions takes a :shortcode: the workspace has, and answers 422
  for one it does not.
• The status emoji comes from the picker, workspace emoji included, instead of a text box
  that took any sixteen characters. A custom one shows as its image wherever the status does;
  in a workspace without it, as its :shortcode:.