git: openjdk/jdk17u-dev: 8343923: GHA: Switch to Xcode 15 on MacOS AArch64 runners

[Martin Doerr]

Changeset: 82a609dd
Branch: master
Author:    Martin Doerr <mdoerr at openjdk.org>
Date:      2024-11-18 16:25:53 +0000
URL:       https://git.openjdk.org/jdk17u-dev/commit/82a609dd7841eab66866e785ddd035b55d441970

8343923: GHA: Switch to Xcode 15 on MacOS AArch64 runners

Backport-of: 4c5bc5f2f091ae861d5329cdae42fe7fa295544b

! .github/workflows/main.yml
! .github/workflows/test.yml