[jdk25u] RFR: 8361478: GHA: Use MSYS2 from GHA runners

[Aleksey Shipilev]

On Fri, 1 Aug 2025 16:46:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Improves GHA performance. The patch was in mainline for a week, and we have seen no problems with it.
> 
> Additional testing:
>  - [x] GHA

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/60#issuecomment-3158212084