ci: use macos-15-intel github CI image

Author: jamaljsr

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         node_version: [20.x]
-        os: [ubuntu-latest, windows-latest, macos-13]
+        os: [ubuntu-latest, windows-latest, macos-15-intel]
 
     steps:
       - name: ubuntu file watcher tweak