fix httpbin listen path in k6 job #275

Job	Run time
tyk-oss (cert-manager)	5m 8s
tyk-oss (datadog)	4m 46s
tyk-oss (elasticsearch)	6m 8s
tyk-oss (elasticsearch-kibana)	7m 1s
tyk-oss (jaeger)	5m 30s
tyk-oss (k6)	4m 7s
tyk-oss (keycloak)	5m 9s
tyk-oss (newrelic)	4m 40s
tyk-oss (opensearch)	7m 39s
tyk-oss (prometheus)	5m 33s
tyk-oss (prometheus-grafana)	5m 56s
tyk-oss (vault)	4m 9s
	1h 5m 46s

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