test(connlib): generate up to 6 resolved IPs (#5218)

With #5049, we will allocate a fixed set of 4 IPs per DNS resource on
the client. In order to ensure that this always works correctly,
increase the number of resolved IPs to at most 6.

rust/connlib/tunnel/src/tests.rs

@@ -2143,7 +2143,7 @@ fn icmp_to_resolved_non_resource() -> impl Strategy<Value = Transition> {
 }
 
 fn resolved_ips() -> impl Strategy<Value = HashSet<IpAddr>> {
-    collection::hash_set(any::<IpAddr>(), 1..4)
+    collection::hash_set(any::<IpAddr>(), 1..6)
 }
 
 fn non_wildcard_dns_resource() -> impl Strategy<Value = Transition> {