update rock to ranger 2.5.1 #163

Job	Run time
Integration tests (microk8s) (integration-charm)	47m 2s
Integration tests (microk8s) (integration-charm)	44m 1s
Integration tests (microk8s) (integration-charm)	43m 8s
Integration tests (microk8s) (integration-charm)	43m 9s
Integration tests (microk8s) (integration-scaling)	23m 0s
Integration tests (microk8s) (integration-scaling)	23m 0s
Integration tests (microk8s) (integration-scaling)	23m 0s
Integration tests (microk8s) (integration-scaling)	23m 0s
Integration tests (microk8s) (integration-upgrades)	24m 5s
Integration tests (microk8s) (integration-upgrades)	24m 5s
Integration tests (microk8s) (integration-upgrades)	24m 5s
Integration tests (microk8s) (integration-upgrades)	24m 5s
Integration tests (microk8s) (integration-policy)	19m 19s
Integration tests (microk8s) (integration-policy)	19m 19s
Integration tests (microk8s) (integration-policy)	19m 19s
Integration tests (microk8s) (integration-policy)	19m 19s
Integration tests (microk8s) (integration-usersync)	22m 34s
Integration tests (microk8s) (integration-usersync)	22m 34s
Integration tests (microk8s) (integration-usersync)	22m 34s
Integration tests (microk8s) (integration-usersync)	22m 34s
	8h 53m 12s

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