upgrade mac builder to macOS 15

Author: Motobug

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
 
   build_macos:
     name: macOS Build
-    runs-on: macos-14
+    runs-on: macos-15-intel
     env:
       CCACHE_BASEDIR: ${{ github.workspace }}
       CCACHE_DIR: ${{ github.workspace }}/.ccache