Update dependency prometheus-operator/prometheus-operator to v0.78.1

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

docs/samples/metrics-and-monitoring/prometheus-operator/kustomization.yaml

@@ -1,5 +1,5 @@
 namePrefix: kfserving-
 namespace: kfserving-monitoring
 resources:
-- github.com/prometheus-operator/prometheus-operator?ref=v0.44.1
+- github.com/prometheus-operator/prometheus-operator?ref=v0.78.1
 - namespace.yaml