GIT_SILENT Update Appstream for new release

data/org.kde.konversation.appdata.xml

@@ -621,10 +621,10 @@
     <binary>konversation</binary>
   </provides>
   <releases>
+    <release version="1.8.21121" date="2022-01-06"/>
     <release version="1.8.21120" date="2021-12-09"/>
     <release version="1.8.21083" date="2021-11-04"/>
     <release version="1.8.21082" date="2021-10-07"/>
-    <release version="1.8.21081" date="2021-09-02"/>
   </releases>
   <custom>
     <value key="KDE::irc">#konversation</value>