Release artifacts for release v1.4.5

[michaelhtm]

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

[knottnt]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knottnt, michaelhtm

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[a-hilaly]

/retest

[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
dynamodb-verify-attribution	3b3be2d	link	false	/test dynamodb-verify-attribution

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