Update references to Release Managers private mailing list

[justaugustus]

ref: kubernetes/sig-release#732

Signed-off-by: Stephen Augustus saugustus@vmware.com

cc: @kubernetes/product-security-committee @kubernetes/sig-release-admins @kubernetes/release-engineering

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[justaugustus]

/sig release
/area release-eng

[justaugustus]

/assign @philips @jbeda @liggitt

[liggitt]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt

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