update dependencies in loadtest-e2e

Author: demonCoder95

test/e2e/loadtest/client/loadtest-deployment.yaml

@@ -24,7 +24,7 @@ spec:
         application: e2e-vegeta
     spec:
       containers:
-      - image: container-registry.zalando.net/teapot/skipper:v0.17.6
+      - image: container-registry.zalando.net/teapot/skipper:v0.21.192
         imagePullPolicy: IfNotPresent
         name: skipper
         args:

test/e2e/loadtest/client/prom-statefulset.yaml

@@ -50,7 +50,7 @@ spec:
           mountPath: /prometheus
       containers:
       - name: prometheus
-        image: container-registry.zalando.net/teapot/prometheus:v2.51.0-master-54
+        image: container-registry.zalando.net/teapot/prometheus:v2.53.1-master-56
         args:
         - --config.file=/prometheus/prometheus.yaml
         - --storage.tsdb.path=/prometheus/