Update boskos dependency to sigs.k8s.io/boskos

[ixdy]

Boskos has moved into kubernetes-sigs/boskos, so I'm preemptively updating the dep here so that future updates are painless. There shouldn't be any notable boskos functionality changes.

[openshift-ci-robot]

Hi @ixdy. Thanks for your PR.

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[petr-muller]

/ok-to-test

[petr-muller]

It builds and passes tests, 🚢

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ixdy, petr-muller

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