RFR: 8318039: GHA: Bump macOS and Xcode versions

[Mikael Vidstedt]

On Thu, 12 Oct 2023 19:25:13 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

> In GHA, the versions of macOS (note: the version used for build/test, **not** the target macOS version we compile for) and Xcode are starting to show age. It's time to update to more modern versions.
> 
> This change bumps the macOS to 13 (from 11) and Xcode to 14.3.1 (from 12.5.1/11.7). This is a prerequisite change for JDK-8317970 / #16155, without which the build SIGSEGVs (presumably some since-fixed issue in Xcode 12.5.1).

Thank you for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/16171#issuecomment-1761889525