ns: add CSYNC to ALLOWED_TYPES

fn/ns.php

@@ -13,7 +13,7 @@ const MIN_TTL = 300;
 const DEFAULT_TTL = 10800;
 const MAX_TTL = 1728000;
 
-const ALLOWED_TYPES = ['AAAA', 'A', 'TXT', 'SRV', 'MX', 'SVCB', 'HTTPS', 'NS', 'DS', 'CAA', 'CNAME', 'DNAME', 'LOC', 'SSHFP', 'TLSA'];
+const ALLOWED_TYPES = ['AAAA', 'A', 'TXT', 'SRV', 'MX', 'SSHFP', 'TLSA', 'NS', 'DS', 'CSYNC', 'CAA', 'CNAME', 'DNAME', 'SVCB', 'HTTPS', 'LOC'];
 
 const ZONE_MAX_CHARACTERS = 10000;