chore: update CI to use Xcode 16.4

Author: grdsdev

.github/workflows/ci.yml

@@ -42,13 +42,13 @@ permissions:
 
 jobs:
   xcodebuild-latest:
-    name: xcodebuild (16.3)
+    name: xcodebuild (16.4)
     runs-on: macos-15
     strategy:
       matrix:
         command: [test, ""]
         platform: [IOS, MACOS]
-        xcode: ["16.3"]
+        xcode: ["16.4"]
         include:
           - { command: test, skip_release: 1 }
     steps:
@@ -123,7 +123,7 @@ jobs:
         run: rm -r Tests/IntegrationTests/*
       - name: "Build Swift Package"
         run: swift build
-      
+
   # android:
   #   name: Android
   #   runs-on: ubuntu-latest