ci: use available macOS runner for final security builder

Author: niakw

.github/workflows/final-security-hardening-once.yml

@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: macos-14
     timeout-minutes: 12
     steps:
       - name: Checkout security hardening branch