fix(ci): Remove deprecated mac 13 runner from build tests

[unidevel]

Description

The macOS-13 based runner images are being deprecated, consider switching to macOS-15 (macos-15-intel) or macOS 15 arm64 (macos-latest) instead. For more details see actions/runner-images#13046

Motivation and Context

Impact

CI

Test Plan

CI

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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

Updates the prestocpp macOS CI workflow to drop the deprecated macos-13 runner and its associated conditional build flags, standardizing the job matrix on macOS 15 only.

Flow diagram for prestocpp macOS CI workflow after macos-13 removal

flowchart TD
  A[Workflow triggered] --> B[Evaluate changes job]
  B --> C[Run prestocpp_macos_build_engine job]
  C --> D[Create matrix with os macos_15]
  D --> E[Run job on macos_15 runner]
  E --> F[Install dependencies via brew]
  F --> G[Configure environment variables]
  G --> H[Run cmake with warnings_as_errors]
  H --> I[Build and test prestocpp]
  I --> J[Report CI status]

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File-Level Changes

Change	Details	Files
Standardize prestocpp macOS CI builds on macOS 15 and remove macOS 13-specific logic.	Update the prestocpp-macos-build workflow matrix to run only on macos-15 instead of both macos-13 and macos-15. Remove conditional CXXFLAGS adjustments that were applied only when running on the macos-13 runner, including overrides for sign-compare and macro-redefined warnings.	.github/workflows/prestocpp-macos-build.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Given the deprecation of macOS-13, consider whether you also want explicit coverage for arm64 (e.g., macos-latest) in the matrix so CI continues to exercise both Intel and Apple Silicon runners.
• The removal of the macOS-13-specific CXXFLAGS suggests the Arrow/Velox warning and macro issues are fully resolved; if they still occur on newer macOS images, it may be safer to keep those flags but make them unconditional or keyed to compiler version instead of OS.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Given the deprecation of macOS-13, consider whether you also want explicit coverage for arm64 (e.g., `macos-latest`) in the matrix so CI continues to exercise both Intel and Apple Silicon runners.
- The removal of the macOS-13-specific `CXXFLAGS` suggests the Arrow/Velox warning and macro issues are fully resolved; if they still occur on newer macOS images, it may be safer to keep those flags but make them unconditional or keyed to compiler version instead of OS.

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