Migrate to Apple Silicon runner and update Xcode version

- Updated CI to run on macOS 15 ARM64 (Apple Silicon) runners
- Changed default simulator devices to ARM-compatible ones
- Updated Xcode to 16.4 for latest SDK support

Author: 이병찬

.github/workflows/ci.yml

@@ -8,24 +8,24 @@ on:
 
 jobs:
   test:
-    runs-on: macOS-latest
+    runs-on: macos-15-arm64  # Apple Silicon
     strategy:
       matrix:
         env:
           - sdk: iphonesimulator
-            destination: platform=iOS Simulator,name=iPhone 12 Pro,OS=latest
+            destination: platform=iOS Simulator,name=iPhone 15 Pro,OS=latest
 
           - sdk: macosx
-            destination: arch=x86_64
+            destination: arch=arm64
 
           - sdk: appletvsimulator
-            destination: platform=tvOS Simulator,name=Apple TV,OS=latest
+            destination: platform=tvOS Simulator,name=Apple TV 4K (3rd generation),OS=latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
-      - name: Select Xcode 12.4
-        run: sudo xcode-select -s /Applications/Xcode_12.4.app
+      - name: Select Xcode 16.4
+        run: sudo xcode-select -s /Applications/Xcode_16.4.app
 
       - name: Generate Xcode Project
         run: swift package generate-xcodeproj --enable-code-coverage