Update OSX helix queue

[MackinnonBuck]

The aspnetcore-helix-matrix main pipeline has been failing for a while with the following error:

Helix queue osx.1200.amd64.open is set for estimated removal date of 2025-01-01. In most cases the queue will be removed permanently due to end-of-life; please contact dnceng for any questions or concerns, and we can help you decide how to proceed and discuss other options.

This PR updates the OSX helix queue to OSX.15.Amd64.Open to fix the failing pipeline.

[wtgodbe]

/azp help

[azure-pipelines]

Supported commands

• help:
• Get descriptions, examples and documentation about supported commands
• Example: help "command_name"
• list:
• List all pipelines for this repository using a comment.
• Example: "list"
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[wtgodbe]

/azp list

[azure-pipelines]

CI/CD Pipelines for this repository:

• aspnetcore-ci
• aspnetcore-quarantined-tests
• aspnetcore-helix-matrix
• aspnetcore-quarantined-pr
• aspnetcore-components-e2e
• aspnetcore-richnav

[wtgodbe]

/azp run aspnetcore-helix-matrix

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[wtgodbe]

https://dev.azure.com/dnceng-public/public/_build/results?buildId=908190&view=results

[wtgodbe]

We should backport this to 9 & 8 if it works

[wtgodbe]

/backport to release/9.0

[wtgodbe]

/backport to release/8.0

[github-actions]

Started backporting to release/9.0: https://github.com/dotnet/aspnetcore/actions/runs/12640906280

[github-actions]

Started backporting to release/8.0: https://github.com/dotnet/aspnetcore/actions/runs/12640907046