[doc] Deprecate macOS 13 and macOS 13 Arm64

[scott-huberty]

Description

I see that the Intel Mac runners are being deprecated, and the process will start on Sept 1st 2025 (so Apologies if I have jumped the gun on this). In the process of updating my workflows, I came to this repo find out what other MacOs options I have. I figured adding the deprecation badge that to the macOS 13 and macOS 13 Arm64 runners would be helpful to others.

Related issue:

#13046

Check list

• Related issue / work item is attached
• Tests are written (if applicable)
• Documentation is updated (if applicable)
• Changes are tested and related VM images are successfully generated

[Copilot]

Pull Request Overview

This PR adds deprecation badges to macOS 13 and macOS 13 Arm64 runners in the README documentation to align with GitHub's announced deprecation of Intel Mac runners starting September 1st, 2025.

• Adds red "Deprecated" badges to macOS 13 and macOS 13 Arm64 entries in the runner table
• Maintains consistency with existing deprecation labeling pattern used for Windows Server 2019

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[erik-bershel]

We have put this matter with macos-13 deprecation on hold for a number of reasons. Let your PR hang around here for now - we'll merge when the time comes.

[radarhere]

If the intention is not to deprecate yet, then is it a problem that the github-actions bot has stopped creating image update PRs for macOS 13?

[erik-bershel]

If the intention is not to deprecate yet, then is it a problem that the github-actions bot has stopped creating image update PRs for macOS 13?

The bot is semi-automated and updates only documentation. The release decision is made by staff on a case-by-case basis. There will be no new macOS 13 release this week for a number of reasons:

• no significant changes;
• issues with Homebrew packages;
• priority is given to updating macOS 14, macOS 15, and macOS 26, as they contain important features and fixes, unlike macOS 13.

[erik-bershel]

I'll merge it on Monday.