Fix test failure

The old nginx image caused test failures because it's a v1 manifest and Docker Hub refuses to let you download them now.

I set the image version to the latest as of today. We only need the container to start once it is approved. This is testing for an unsigned image - I'm betting that if nginx ever do decide to sign their images using simple signing in future, they won't go back and sign old images.

Signed-off-by: Michael Hough <michaelh@uk.ibm.com>

test/e2e/testdata/deployment/dockerhub-nginx-unsigned.yaml

@@ -17,6 +17,6 @@ spec:
     spec:
       containers:
       - name: nginx
-        image: nginx:1.7.9
+        image: nginx:1.26.0
         ports:
-        - containerPort: 80
+        - containerPort: 80