Release artifacts for release v1.1.1

[michaelhtm]

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

[ack-prow]

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

Test name	Commit	Details	Required	Rerun command
sns-verify-attribution	4ed3d03	link	false	/test sns-verify-attribution

Full PR test history. Your PR dashboard.

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[a-hilaly]

/lgtm
/hold

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, michaelhtm

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[a-hilaly]

/unhold