mkdocs.yml: Update latest_tag_4_6 to 4.6.12 (#2508)

(cherry picked from commit 086be4b)

Author: adriendupuis

mkdocs.yml

@@ -700,7 +700,7 @@ extra:
   latest_tag_4_3: '4.3.5'
   latest_tag_4_4: '4.4.4'
   latest_tag_4_5: '4.5.7'
-  latest_tag_4_6: '4.6.11'
+  latest_tag_4_6: '4.6.12'
 
   symfony_doc: 'http://symfony.com/doc/5.4'
   user_doc: 'https://doc.ibexa.co/projects/userguide/en/master'