RFR: 731: Do not include target hash in cached PR metadata

[Erik Helin]

On Mon, 28 Sep 2020 07:43:51 GMT, Robin Westberg <rwestberg at openjdk.org> wrote:

> Avoid using the target branch hash in check metadata calculation, as the pull request update cache will hide such
> updates anyway.
> Best regards,
> Robin

Looks good!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/850