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keyring: filter by region before checking version
In #14821 we fixed a panic that can happen if a leadership election happens in the middle of an upgrade. That fix checks that all servers are at the minimum version before initializing the keyring (which blocks evaluation processing during trhe upgrade). But the check we implemented is over the serf membership, which includes servers in any federated regions, which don't necessarily have the same upgrade cycle. Filter the version check by the leader's region.
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