Add macOS 15 CI images with Xcode 16

[targos]

V8 builds now need at least Xcode 16.3, which requires us to bump macOS to at least 15.2.

See https://github.com/nodejs/node/issues/58069 Example failing canary release: https://ci-release.nodejs.org/job/iojs+release/10961/

@ryanaslett Is this something that can be done? I don't know if we would have to use the newer version for all jobs or if can keep macOS 13 and 15 in parallel and select a version in the Jenkins jobs based on the Node.js version.