GIT_SILENT Update Appstream for new release

(cherry picked from commit ddf25f4e)

src/org.kde.ksnakeduel.appdata.xml

@@ -115,9 +115,9 @@
     <binary>ksnakeduel</binary>
   </provides>
   <releases>
+    <release version="2.1.21042" date="2021-06-10"/>
     <release version="2.1.21041" date="2021-05-13"/>
     <release version="2.1.21040" date="2021-04-22"/>
     <release version="2.1.20123" date="2021-03-04"/>
-    <release version="2.1.20122" date="2021-02-04"/>
   </releases>
 </component>