RFR: Avoid considering fixVersions that are not valid releases when calculating the hgupdate-sync label [v2]

[Magnus Ihse Bursie]

On Fri, 12 Feb 2021 14:19:01 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

>> There may be backport records that have fixVersions that should be ignored when calculating which of them should receive the hgupdate-sync label.
>
> Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix compile issue

Marked as reviewed by ihse (no project role).

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PR: https://git.openjdk.java.net/skara/pull/1010