[jdk25u] RFR: 8363966: GHA: Switch cross-compiling sysroots to Debian trixie

[Aleksey Shipilev]

On Mon, 15 Sep 2025 11:15:18 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Enables up-to-date and consistent cross-compilation across all arches.
> 
> Additional testing:
>  - [x] GHA

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk25u/pull/200#issuecomment-3299554338