remove macos-12 runner label

[shogo82148]

The macOS 12 runner image has been deprecated on 10/7/2024, and will be fully unsupported by 12/3/2024

• [macOS] The macOS 12 Actions runner image will begin deprecation on 10/7/24 and will be fully unsupported by 12/3/24 for GitHub and by 01/13/25 for ADO actions/runner-images#10721
• https://github.blog/changelog/2024-08-19-notice-of-upcoming-deprecations-and-breaking-changes-in-github-actions-runners/

[rhysd]

Thanks. I believe we should merge this after 2024 12/3 and after the issue has been closed.

[rhysd]

This review comment is to block the merge until the runner is completely dropped.

[AlexSkrypnyk]

Also, macos-15 is available, but reported as false positive by actionlint.

[rhysd]

macos-15 was supported at 1.7.3. If actionlint still complains about it, it should be a bug.

https://github.com/rhysd/actionlint/releases/tag/v1.7.3

EDIT: I checked the following minimal workflow with actionlint 1.7.4 and I didn't see any error. I guess your actionlint command is old.

on: push

jobs:
  example-job:
    runs-on: macos-15
    steps:
      - run: echo hello