ci: use macos-15 runner for Xcode 16 project format compatibility

Author: Daniel-Robbins

.github/workflows/release-mac.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   build-macos-dmg:
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - name: Checkout
         uses: actions/checkout@v4