xcode version updated

Author: Harjot1508

.github/workflows/dart.yml

@@ -44,7 +44,7 @@ jobs:
 
       - uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: "15.0.1"
+          xcode-version: "16.4.0"
 
       - uses: actions/setup-java@v1
         with: