bump xcode version

Author: pictos

.github/workflows/dotnet-macos.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Setup Xcode
       uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: '16.3'
+        xcode-version: '16.4'
 
     - name: Workload install
       run: dotnet workload install maui