Fix citation JSON exception

Update method declaration. This is called from the controller/view to
render to citations as JSON. Rails used to pass an options argument but
now doesn't.

Fixes #8545

app/models/citation.rb

@@ -72,7 +72,7 @@ def applies_to_batch_request?
     citable.is_a?(InfoRequestBatch)
   end
 
-  def as_json(_options)
+  def as_json
     citable_path = case citable
                    when InfoRequest
                      request_path(citable)