Post-merge fix: Change one more 10.6

This was missed in the merge 272828a.

Author: dr-m

debian/additions/mariadb.conf.d/50-server.cnf

@@ -110,7 +110,7 @@ collation-server      = utf8mb4_general_ci
 # you can put MariaDB-only options here
 [mariadb]
 
-# This group is only read by MariaDB-10.5 servers.
+# This group is only read by MariaDB-10.6 servers.
 # If you use the same .cnf file for MariaDB of different versions,
 # use this group for options that older servers don't understand
-[mariadb-10.5]
+[mariadb-10.6]