Switch wheel build to macos-15-intel

Author: inducer

.github/workflows/wheels.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-13, macos-14, ubuntu-22.04-arm]
+        os: [ubuntu-latest, macos-15-intel, macos-14, ubuntu-22.04-arm]
 
     steps:
       - uses: actions/checkout@v5