Fix crash when likes or shares collections are not inlined (#34618)

app/lib/activitypub/parser/status_parser.rb

@@ -95,11 +95,11 @@ class ActivityPub::Parser::StatusParser
   end
 
   def favourites_count
-    @object.dig('likes', 'totalItems')
+    @object.dig('likes', 'totalItems') if @object.is_a?(Hash)
   end
 
   def reblogs_count
-    @object.dig('shares', 'totalItems')
+    @object.dig('shares', 'totalItems') if @object.is_a?(Hash)
   end
 
   def quote_policy