macos-13 is retired, trying macos-15

Author: olleolleolle

.github/workflows/test.yml

@@ -22,8 +22,8 @@ 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, ruby: '2.4' }
+        - { os: macos-15, ruby: '2.5' }
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v6