macos-14 is retired

Author: eregon

README.md

@@ -49,7 +49,7 @@ The action works on these [GitHub-hosted runners](https://docs.github.com/en/act
 | Operating System | Supported |
 | ---------------- | --------- |
 | Ubuntu  | `ubuntu-22.04`, `ubuntu-24.04`, `ubuntu-26.04`, `ubuntu-22.04-arm`, `ubuntu-24.04-arm`, `ubuntu-26.04-arm` |
-| macOS   | `macos-14` and newer versions |
+| macOS   | `macos-15` and newer versions |
 | Windows | `windows-2022`, `windows-2025`, `windows-11-arm` |
 
 Not all combinations of runner images and versions are supported.

dist/index.js

@@ -18,7 +18,6 @@ def unique_versions(versions, segment_count, *symbolic)
 
 # Runners
 runners = %w[
-  macos-14
   macos-15
   macos-15-intel
   ubuntu-22.04

generate-test-matrix.rb

@@ -178,8 +178,6 @@ function validateRubyEngineAndVersion(platform, engineVersions, engine, parsedVe
   if (engine === 'ruby' && platform.startsWith('macos') && os.arch() === 'arm64' && common.floatVersion(version) < 2.6) {
     throw new Error(`CRuby < 2.6 does not support macos-arm64.
         Either use a newer Ruby version or use a macOS image running on amd64, e.g., macos-15-intel.
-        Note that GitHub changed the meaning of macos-latest from macos-12 (amd64) to macos-14 (arm64):
-        https://github.blog/changelog/2024-04-01-macos-14-sonoma-is-generally-available-and-the-latest-macos-runner-image/
 
         If you are using a matrix of Ruby versions, a good solution is to run only < 2.6 on amd64, like so:
         matrix: