build macos wheel on 10.15

Author: Spitfire1900

.github/workflows/wheels.yml

@@ -17,7 +17,7 @@ jobs:
         - name: linux
           os: ubuntu-24.04
         - name: macos
-          os: macos-13
+          os: macos-15
 
     steps:
       - uses: actions/checkout@v4