Add new release to icons.metainfo.xml.in

Author: wpkelso

data/icons.metainfo.xml.in

@@ -29,6 +29,7 @@
   <update_contact>contact_at_elementary.io</update_contact>
 
   <releases>
+    <release version="8.1.0" date="2024-08-21" urgency="medium"></release>
     <release version="8.0.0" date="2023-05-06" urgency="medium">
         <p>Additions:</p>
         <ul>