update GitHub build to use Xcode 16.4

.github/workflows/build_trio.yml

@@ -234,7 +234,7 @@ jobs:
       )
     steps:
       - name: Select Xcode version
-        run: "sudo xcode-select --switch /Applications/Xcode_16.3.app/Contents/Developer"
+        run: "sudo xcode-select --switch /Applications/Xcode_16.4.app/Contents/Developer"
       
       - name: Checkout Repo for syncing
         if: |