Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `app/models/custom_emoji.rb`:
  Slight refactor upstream, next to a line that was different in glitch-soc
  because of our local configurable limits on custom emoji size.
  Ported upstream changes.
- `yarn.lock`:
  Not really a conflict, upstream dependency textually too close to a
  glitch-soc-only dependency.
  Updated upstream dependency as upstream.

app/models/custom_emoji.rb

@@ -21,6 +21,8 @@
 #
 
 class CustomEmoji < ApplicationRecord
+  include Attachmentable
+
   LOCAL_LIMIT = (ENV['MAX_EMOJI_SIZE'] || 50.kilobytes).to_i
   LIMIT       = [LOCAL_LIMIT, (ENV['MAX_REMOTE_EMOJI_SIZE'] || 200.kilobytes).to_i].max
 
@@ -35,7 +37,7 @@ class CustomEmoji < ApplicationRecord
   belongs_to :category, class_name: 'CustomEmojiCategory', optional: true
   has_one :local_counterpart, -> { where(domain: nil) }, class_name: 'CustomEmoji', primary_key: :shortcode, foreign_key: :shortcode
 
-  has_attached_file :image, styles: { static: { format: 'png', convert_options: '-coalesce -strip' } }
+  has_attached_file :image, styles: { static: { format: 'png', convert_options: '-coalesce -strip' } }, validate_media_type: false
 
   before_validation :downcase_domain
 
@@ -52,8 +54,6 @@ class CustomEmoji < ApplicationRecord
 
   remotable_attachment :image, LIMIT
 
-  include Attachmentable
-
   after_commit :remove_entity_cache
 
   def local?