fix: resolve iOS CI sandbox errors by disabling User Script Sandboxing

- Set ENABLE_USER_SCRIPT_SANDBOXING = NO in all iOS build configurations
- This fixes "Sandbox: rsync.samba deny file-write-create" errors in CI
- Update macOS runners from macos-latest to macos-13 for better stability
- Resolves "Failed to parse Target Device Version" and sandbox permission issues

Reference: flutter/flutter#128739
Reference: CocoaPods/Xcodeproj#989

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ened

.github/workflows/examples.yml

@@ -27,7 +27,7 @@ jobs:
           cd example && flutter build apk --debug
 
   example_ios:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
           flutter test
 
   native_ios_tests:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2
@@ -68,7 +68,7 @@ jobs:
         device:
           - "iPhone 16 Pro"
       fail-fast: false
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: subosito/flutter-action@v2

example/ios/Runner.xcodeproj/project.pbxproj

@@ -484,7 +484,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
@@ -569,7 +569,7 @@
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
-				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -627,7 +627,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
-				ENABLE_USER_SCRIPT_SANDBOXING = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;