Release artifacts for release v1.6.1

[michaelhtm]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michaelhtm

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[michaelhtm]

/hold

[ack-prow]

@michaelhtm: 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
rds-verify-attribution	9252f8b	link	false	/test rds-verify-attribution
rds-kind-e2e	9252f8b	link	true	/test rds-kind-e2e

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