Change Synapse default room version from 9 to 10

roles/custom/matrix-synapse/defaults/main.yml

@@ -844,7 +844,7 @@ matrix_synapse_room_list_publication_rules:
     room_id: "*"
     action: allow
 
-matrix_synapse_default_room_version: "9"
+matrix_synapse_default_room_version: "10"
 
 # Controls the Synapse `spam_checker` setting.
 #