chore(sitemap.xml): show last updated series first

Author: php-coder

src/main/resources/sql/series_dao_queries.properties

@@ -71,8 +71,10 @@ UPDATE series \
  WHERE id = :series_id
 
 series.find_all_for_sitemap = \
-SELECT s.id, s.updated_at \
-  FROM series s
+  SELECT id \
+       , updated_at \
+    FROM series \
+ORDER BY updated_at DESC
 
 series.find_similar_series = \
    SELECT s.id \