fix mac-intel runner

Author: GFJHogue

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
         runs-on: ${{ matrix.os }}
         strategy:
             matrix:
-                os: [ubuntu-latest, macos-13]
+                os: [ubuntu-latest, macos-15-intel]
 
         steps:
             - uses: actions/checkout@v4