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With the new TC resolution the community replaces Extended Maintenance with Unmaintained status [1]. To accomodate this, validator needs to be extended to accept <series>-eom tags that applies at the tip of the given stable/<series> branch and the new unmaintained/<series> branch will be cut from that tag. [1] https://governance.openstack.org/tc/resolutions/20230724-unmaintained-branches.html Change-Id: I606ba5e5f8fd783d6c3f83356ded27a46e8bac56