[jdk25u] Integrated: 8369226: GHA: Switch to MacOS 15

[Aleksey Shipilev]

On Fri, 10 Oct 2025 12:44:03 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Switching MacOS builders ahead of upcoming brownouts and deprecations.
> 
> Additional testing:
>  - [x] GHA

This pull request has now been integrated.

Changeset: 667daee3
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk25u/commit/667daee3683897956d2af755b28e9376a664cb75
Stats:     6 lines in 1 file changed: 0 ins; 0 del; 6 mod

8369226: GHA: Switch to MacOS 15

Backport-of: 1ea8cfa6dc8e6f96fd87553331abaae17ec173ea

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PR: https://git.openjdk.org/jdk25u/pull/289