fix(ci): Use macOS 15 Intel image

[czentgr]

The macOS 13 images for github runners are
deprecated and this replaces the macOS 13
Intel image with a macOS 15 Intel image.

Description

Motivation and Context

Impact

Test Plan

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Release Notes

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== NO RELEASE NOTE ==

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces the deprecated macOS 13 GitHub Actions runner with the macOS 15 Intel image in the CI workflow by updating the build matrix.

File-Level Changes

Change	Details	Files
Update CI workflow to use macOS 15 Intel image	Changed matrix.os entry from macos-13 to macos-15-intel Retained macos-15 entry alongside the new Intel variant	.github/workflows/prestocpp-macos-build.yml

Possibly linked issues

• Add release notes for 0.217 #12345: The PR updates the macOS runner image for the 'prestocpp-macos-build-engine' CI job, which is reported as broken in the issue.

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[czentgr]

Taken care of already.