try bumping xcode version

Author: jamieQ

.github/workflows/swift.yaml

@@ -7,7 +7,7 @@ on:
   pull_request:
 
 env:
-  XCODE_VERSION: 15.1
+  XCODE_VERSION: 16.1
   IOS_DESTINATION: platform=iOS Simulator,OS=17.2,name=iPad (10th generation)
   TUIST_TEST_DEVICE: iPad (10th generation)
   TUIST_TEST_PLATFORM: iOS