Fix set-milestone failure when latest milestone is closed #15054
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Description
There can be situation where the latest milestone is closed but there are still some PRs for which this workflow is pending. The API by default only lists open milestones. This commit changes it to list all milestones so that even if the target milestone is closed it can be found and the PR added to it.
Non-technical explanation
Fix occasional set-milestone failure.
Release notes
(x) This is not user-visible or docs only and no release notes are required.