use latest xcode

Author: morganchen12

.github/workflows/anonymousauth.yml

@@ -32,6 +32,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@main
+      - name: Select Xcode version
+        run: |
+          xcode-select -switch /Applications/Xcode_16.1.app/Contents/Developer
       - name: Setup
         run: |
           cd FirebaseAnonymousAuthUI

samples/objc/Podfile

@@ -1,4 +1,4 @@
-platform :ios, '13.0'
+platform :ios, '15.0'
 
 target 'FirebaseUI-demo-objc' do
   use_frameworks!

samples/swift/FirebaseUI-demo-swift.xcodeproj/project.pbxproj

@@ -780,7 +780,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Debug;
 		};
@@ -818,7 +818,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.google.firebase.firebaseui.FirebaseUI-demo-swift";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "";
-				SWIFT_VERSION = 5.0;
+				SWIFT_VERSION = 6.0;
 			};
 			name = Release;
 		};