Fix synchronous recursive fetching of deeply-nested quoted posts (#35600)

lib/exceptions.rb

@@ -14,6 +14,7 @@ module Mastodon
   class InvalidParameterError < Error; end
   class SignatureVerificationError < Error; end
   class MalformedHeaderError < Error; end
+  class RecursionLimitExceededError < Error; end
 
   class UnexpectedResponseError < Error
     attr_reader :response