net: dns: Increase the size of dispatcher table

The dispatcher table needs to be large enough to have support
for all file descriptor values.

Fixes #79042

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>

subsys/net/lib/dns/dispatcher.c

@@ -31,7 +31,7 @@ NET_BUF_POOL_DEFINE(dns_msg_pool, DNS_RESOLVER_BUF_CTR,
 
 static struct socket_dispatch_table {
  struct dns_socket_dispatcher *ctx;
-} dispatch_table[CONFIG_NET_SOCKETS_POLL_MAX];
+} dispatch_table[CONFIG_ZVFS_OPEN_MAX];
 
 static int dns_dispatch(struct dns_socket_dispatcher *dispatcher,
  int sock, struct sockaddr *addr, size_t addrlen,