ci: Bump macOS runner version

Fixes #367

Author: ltoenning

.github/workflows/build.yml

@@ -378,7 +378,7 @@ jobs:
           path: ${{ github.workspace }}/xswiftbus-*
 
   buildMacOS:
-    runs-on: macos-13
+    runs-on: macos-15
     needs: [preBuild, checks]
     env:
       BACKTRACE_SYMBOL_TOKEN: ${{ secrets.BACKTRACE_SYMBOL_TOKEN }}