Fix more caption types

Author: tarleb

src/resources/filters/quarto-pre/parsefiguredivs.lua

@@ -495,7 +495,7 @@ function parse_floatreftargets()
       end
 
       -- we've parsed the caption, so we can remove it from the table
-      el.caption.long = pandoc.List({})
+      el.caption.long = pandoc.Blocks({})
 
       if label == "" then
         return nil