Use macos-14 instead of macos-13 in CI

[sosukesuzuki]

macos-13 machines will be deprecated so we should use macos-14 ( actions/runner-images#13046 ).

In fact, our build is failing due to this https://github.com/oven-sh/WebKit/actions/runs/19271032742/job/55099084552

[coderabbitai]

Walkthrough

Updated macOS runner specifications in GitHub Actions workflow from macos-13-* to macos-15-* across all job configurations (largest, xlarge, asan variants) in both Debug and Release builds.

Changes

Cohort / File(s)	Summary
GitHub Actions workflow \.github/workflows/build-reusable\.yml	Updated macOS runner specifications from macos-13-* to macos-15-* for all job variants (largest, xlarge, asan) in both Debug and Release configurations

Pre-merge checks

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title states 'macos-14' but the actual changes update runners to 'macos-15', not 'macos-14'. The title is misleading about the specific version being updated to.	Update the PR title to 'Use macos-15 instead of macos-13 in CI' to accurately reflect the changes made in the pull request.
Description check	⚠️ Warning	The PR description lacks the required bug reference, Reviewed-by line, and detailed explanation format specified in the WebKit template.	Add a Bugzilla bug reference (or note if this is infrastructure-only), include 'Reviewed by' line, and provide a structured explanation of the change following the WebKit PR template format.

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