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

Conflicts:
- `app/models/custom_emoji.rb`:
  Not a real conflict, just upstream changing a line too close to
  a glitch-soc-specific validation.
  Applied upstream changes.
- `app/models/public_feed.rb`:
  Not a real conflict, just upstream changing a line too close to
  a glitch-soc-specific parameter documentation.
  Applied upstream changes.

spec/lib/webfinger_resource_spec.rb

@@ -50,7 +50,7 @@ describe WebfingerResource do
       end
 
       it 'finds the username in a mixed case http route' do
-        resource = 'HTTp://exAMPLEe.com/users/alice'
+        resource = 'HTTp://exAMPLe.com/users/alice'
 
         result = WebfingerResource.new(resource).username
         expect(result).to eq 'alice'