Bumped production release number for 1.28

[mahakagi]

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[eks-distro-bot]

@mahakagi: 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
aws-cloud-controller-manager-1-31-presubmit	79bf80c	link	true	/test aws-cloud-controller-manager-1-31-presubmit
aws-cloud-controller-manager-1-29-presubmit	79bf80c	link	true	/test aws-cloud-controller-manager-1-29-presubmit
aws-cloud-controller-manager-1-28-presubmit	79bf80c	link	true	/test aws-cloud-controller-manager-1-28-presubmit
aws-cloud-controller-manager-1-30-presubmit	79bf80c	link	true	/test aws-cloud-controller-manager-1-30-presubmit

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