Correct the list of leapp and leapp-repository rpms, that should be preserved during the 9to10 upgrade

Author: yuravk

repos/system_upgrade/common/libraries/dnfconfig.py

@@ -19,6 +19,8 @@ def get_leapp_packages():
     generic = ['leapp', 'snactor']
     if get_source_major_version() == '7':
         return generic + ['python2-leapp', 'leapp-upgrade-el7toel8']
+    elif get_source_major_version() == '9':
+        return generic + ['python3-leapp', 'leapp-upgrade-el9toel10']
 
     return generic + ['python3-leapp', 'leapp-upgrade-el8toel9']