Ingress NGINX: Promote Test Runner v1.4.2.

Commit: kubernetes/ingress-nginx@5a30ef6
Job: https://prow.k8s.io/view/gs/kubernetes-ci-logs/logs/post-ingress-nginx-test-runner/1971124600536305664
Build: https://storage.googleapis.com/kubernetes-ci-logs/logs/post-ingress-nginx-test-runner/1971124600536305664/artifacts/build.log

Author: Gacko

registry.k8s.io/images/k8s-staging-ingress-nginx/images.yaml

@@ -379,6 +379,7 @@
     "sha256:ba366ecc1a67022d4f02193faf7af284fa7642e7a55f3eef1e52069c9fe306f0": ["v1.4.0"]
     "sha256:a550c4fc42804e80b43d75511b888e9c287e2bfce9f186a2d7b9b2d686042e61": ["v1.4.1"]
     "sha256:9a4f68e566b9ca69285e6d5d4e65a91eb563d8d52b652b631199b9f754fd7502": ["v1.4.2"]
+    "sha256:72d00318c06e70ce5e8e23eec473cb4abe0597080e5d1585b18788a22cf7fa2a": ["v1.4.3"]
     "sha256:78c1e675520ae9345789fdaf684ccb335a94938390dc6f9f651dd93164f3a888": ["v2.0.1"]
     "sha256:192e9e4b4f660093a3bc73e1a5e702ee287eb2a351f38cdc5f72e1ff94e65e31": ["v2.0.2"]
     "sha256:1016d108440ed31a453ef397fcd2c3b1236f7375830deece65ca34dd8500882d": ["v2.0.3"]