fix(grafana_screenshot): increase timeout for taking screenshot
fix(grafana_screenshot): increase timeout for taking screenshot

timeout for taking screenshot for grafana increased up to 2 minutes.
this should fix issue with loading dashboards

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests