As announced at [1], the macOS 13 runner image is closing down in Github Actions.

This will affect OpenJDK's `macos-x64` builds on different JDK versions, that currently use the `macos-13` image.

Quoting:

The macOS 13 runner image will be retired by December 4th, 2025. To raise awareness of the upcoming removal, jobs using macOS 13 will temporarily fail during the scheduled brownout time periods defined below:

- November 4, 14:00 UTC to November 5, 00:00 UTC
- November 11, 14:00 UTC to November 12, 00:00 UTC
- November 18, 14:00 UTC to November 19, 00:00 UTC
- November 25, 14:00 UTC to November 26, 00:00 UTC

[1] - https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down/