RFR: 8358538: Update GHA Windows runner to 2025

Wed Jun 4 17:03:07 UTC 2025

On Wed, 4 Jun 2025 13:06:07 GMT, Andrew John Hughes <andrew at openjdk.org> wrote:

> There's another case of WIndows 2019 in `main.xml` for `test-windows-x64` not fixed here, which is why the testing is stalled.

Oh bummer, I did not see that. Fingers crossed that it's enough to just bump that number.

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PR Comment: https://git.openjdk.org/jdk/pull/25628#issuecomment-2940758578