bump zombienet version `v1.3.116` (#6155)

Bump zombienet version, includes fixes for `ci`. (mostly timeouts for
k8s).

.gitlab/pipeline/zombienet.yml

 .zombienet-refs:
   extends: .build-refs
   variables:
-    ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.115"
+    ZOMBIENET_IMAGE: "docker.io/paritytech/zombienet:v1.3.116"
     PUSHGATEWAY_URL: "http://zombienet-prometheus-pushgateway.managed-monitoring:9091/metrics/job/zombie-metrics"
     DEBUG: "zombie,zombie::network-node,zombie::kube::client::logs"
     ZOMBIE_PROVIDER: "k8s"