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

Conflicts:
- `Gemfile.lock`:
  glitch-soc-only dependency textually too close to updated upstream
  dependencies. Updated to upsteam dependencies.

app/models/account.rb

@@ -67,6 +67,7 @@ class Account < ApplicationRecord
   include Paginable
   include AccountCounters
   include DomainNormalizable
+  include AccountMerging
 
   MAX_DISPLAY_NAME_LENGTH = (ENV['MAX_DISPLAY_NAME_CHARS'] || 30).to_i
   MAX_NOTE_LENGTH = (ENV['MAX_BIO_CHARS'] || 500).to_i