fix TestErrorSpam failing on warning

test/integration/error_spam_test.go

@@ -49,6 +49,8 @@ var stderrAllow = []string{
 	`Your cgroup does not allow setting memory.`,
 	// progress bar output
 	`    > .*`,
+	// Warning of issues with specific Kubernetes versions
+	`Kubernetes .* has a known `,
 }
 
 // stderrAllowRe combines rootCauses into a single regex