GitHub: Update CI

Update iOS build environment to Xcode 26.1

Author: brianchang928

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
         run: ./gradlew assembleRelease
 
   build-ios:
-    runs-on: macos-latest
+    runs-on: macos-26
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -34,8 +34,8 @@ jobs:
           java-version: 21
           cache: gradle
 
-      - name: Select Xcode 16.4
-        run: sudo xcode-select --switch /Applications/Xcode_16.4.app
+      - name: Select Xcode 26.1
+        run: sudo xcode-select --switch /Applications/Xcode_26.1.app
 
       - name: Build iOS
         run: |