RFR: 8361478: GHA: Use MSYS2 from GHA runners

[Aleksey Shipilev]

On Mon, 7 Jul 2025 09:24:20 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Installing MSYS2 takes considerable time in our Windows workflows. Fortunately, GHA runners currently ship with MSYS2 bundled! The docs for setup-msys2 step say it is enough to say `release: false` to use those:
>  https://github.com/msys2/setup-msys2?tab=readme-ov-file#release
> 
> Also bumping the action version to gain access to the actual installed path.
> 
> Additional testing:
>  - [x] GHA

Thanks! I am going to re-merge to confirm that GHA still works, and then integrate.

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PR Comment: https://git.openjdk.org/jdk/pull/26156#issuecomment-3103579135