RFR: 2512: Update windows version in github runner [v2]

Mon Jun 2 17:45:50 UTC 2025

On Mon, 2 Jun 2025 17:35:02 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> Sure
>
> oh, it failed on windows-2025... Will investigate it

Looking at the documentation for these configurations, windows-2025 does not have Mercurial anymore. I think it's ok to not verify Mercurial dependent tests on Windows (or perhaps at all), so we could add assumes to those tests and check if Mercurial is available.

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PR Review Comment: https://git.openjdk.org/skara/pull/1721#discussion_r2121794462