Enable macos-15 runner

Author: kubkon

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-13, macos-14 ]
+        os: [ macos-13, macos-14, macos-15 ]
 
     steps:
     - uses: actions/checkout@v3