GIT_SILENT Update Appstream for new release

(cherry picked from commit b23571bf)

data/org.kde.kmines.appdata.xml

@@ -118,9 +118,9 @@
   </provides>
   <project_group>KDE</project_group>
   <releases>
+    <release version="4.0.21042" date="2021-06-10"/>
     <release version="4.0.21041" date="2021-05-13"/>
     <release version="4.0.21040" date="2021-04-22"/>
     <release version="4.0.20123" date="2021-03-04"/>
-    <release version="4.0.20122" date="2021-02-04"/>
   </releases>
 </component>