use macos-14

Author: qui-jason

.github/workflows/dargon2_flutter_tests.yml

@@ -12,7 +12,7 @@ defaults:
 
 jobs:
   test_android:
-    runs-on: macos-latest
+    runs-on: macos-14
     steps:
       - name: Checkout
         uses: actions/checkout@v4