Fix #555 by making attached_ips subscriptable (#609)

Author: rodvand

plugins/module_utils/netbox_ipam.py

@@ -81,7 +81,7 @@ def _ensure_ip_in_prefix_present_on_netif(
 
         attached_ips = nb_endpoint.filter(**query_params)
         if attached_ips:
-            self.nb_object = list(attached_ips[-1]).serialize()
+            self.nb_object = list(attached_ips)[-1].serialize()
             self.result["changed"] = False
             self.result["msg"] = "%s %s already attached" % (
                 endpoint_name,