Add placeholder for mageia 9

It may not be enabled until madb entries for mageia 9 packages appear

Author: AMDmi3

repos.d/rpm/mageia.yaml

@@ -50,4 +50,5 @@
 
 {{ mageia(7, valid_till='2021-06-30') }}
 {{ mageia(8, valid_till='2023-11-30') }}
+{# mageia(9, valid_till='2025-03-31') #} # only enable as soon as madb entries appear
 {{ mageia('cauldron') }}