Pin ACK runtime to v0.56.0

[michaelhtm]

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

[a-hilaly]

/test ec2-controller-test

[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
verify-attribution	6345183	link	false	/test verify-attribution
s3-olm-test	6345183	link	false	/test s3-olm-test

Full PR test history. Your PR dashboard.

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[knottnt]

/test ec2-controller-test

[michaelhtm]

/test ec2-controller-test

[knottnt]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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