move pleroma-tan just a tiny bit lower

src/components/update_notification/update_notification.scss

@@ -4,7 +4,7 @@
 }
 
 .UpdateNotificationModal {
-  --__top-fringe: 18em; // how much pleroma-tan should stick her head above
+  --__top-fringe: 15em; // how much pleroma-tan should stick her head above
   --__bottom-fringe: 80em; // just reserving as much as we can, number is mostly irrelevant
   --__right-fringe: 8em;