catch HTTPError when updating discord avatar

app/models/api_user.rb

@@ -77,6 +77,8 @@ class APIUser < ApplicationRecord
     avatar.attach(io: image, filename: "#{hash}.webp")
     update!(last_avatar_hash: hash)
     true
+  rescue OpenURI::HTTPError => e
+    Rails.logger.warn(e)
   end
 
   def can_create_apikey?