[jdk11u-dev] RFR: 8369226: GHA: Switch to MacOS 15

[Severin Gehwolf]

On Wed, 12 Nov 2025 14:23:58 GMT, Antonio Vieiro <avieiro at openjdk.org> wrote:

> Backport of [JDK-8369226](https://bugs.openjdk.org/browse/JDK-8369226) from JDK17 that upgrades `macos-13` runners to `macos-15-intel`, and XCode from `14.3.1` to `16.4`, since `macos-13` will be removed in early december.
> 
> The backport is not clean, as there are many differences between GHA in JDK11 and upper versions (e.g.
> [JDK-8341097](https://bugs.openjdk.org/browse/JDK-8341097), [JDK-8325194](https://bugs.openjdk.org/browse/JDK-8325194)).
> 
> One test failed with the new configuration, due to [JDK-8368192](https://bugs.openjdk.org/browse/JDK-8368192). This is included in a second commit. 
> 
> Some other tests in `tier1` are also failing on `macos` and may require future backports.

Please move JDK-8368192 to a separate PR/backport.

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PR Comment: https://git.openjdk.org/jdk11u-dev/pull/3117#issuecomment-3527073646