Merge pull request #53 from ruby/macos15

Replaced macos-15-intel from macos-13

Author: hsbt

.github/workflows/test.yml

@@ -20,8 +20,9 @@ jobs:
           - { os: macos-latest, ruby: '2.4' }
           - { os: macos-latest, ruby: '2.5' }
         include:
-          - { os: macos-13, ruby: '2.4' }
-          - { os: macos-13, ruby: '2.5' }
+          - { os: macos-15-intel, ruby: '2.4' }
+          - { os: macos-15-intel, ruby: '2.5' }
+          - { os: macos-15-intel, ruby: '3.4' }
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v6