ci: replace deprecated macos-13 runner with macos-15-intel

[hyperfinitism]

Summary

This PR updates the GitHub Actions workflow to replace the deprecated macos-13 runner (previously used for x86_64 builds) with macos-15-intel, which is the supported replacement.

Background

According to the GitHub Actions Runner Images documentation,

• macos-13 is no longer maintained and has been marked as deprecated by GitHub.
• macos-15-intel should be used instead for x86_64-based macOS jobs.

Summary by Sourcery

CI:

• Replace deprecated macos-13 runner with macos-15-intel for x86_64 macOS jobs in release-build, release-test, and test workflows

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the GitHub Actions workflows by replacing the deprecated macos-13 runner with macos-15-intel for all x86_64 macOS build and test jobs, ensuring continued maintenance support.

File-Level Changes

Change	Details	Files
Replaced deprecated macOS runner in CI workflows	Updated os field from macos-13 to macos-15-intel in release-build.yml Updated os field from macos-13 to macos-15-intel in release-test.yml Updated os field from macos-13 to macos-15-intel in test.yml	.github/workflows/release-build.yml .github/workflows/release-test.yml .github/workflows/test.yml

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