[release-v1.15] Bump knative.dev/hack to 1.15 backport

[cardil]

Restoring build for release-1.15

Related to knative/hack#440

[cardil]

/assign @maschmid
/cc @Kaustubh-pande
/cc @rudyredhat1

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@cardil: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/419-test-e2e	85f9363	link	true	/test 419-test-e2e
ci/prow/419-test-e2e-tls	85f9363	link	true	/test 419-test-e2e-tls

Full PR test history. Your PR dashboard.

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