fix(podspec): update platform versions to match OpenIAP

- Update tvOS deployment target from 15.0 to 16.0
- Keep watchOS 8.0 support (StoreKit 2 supported)

Closes #3141

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: hyochan

NitroIap.podspec

@@ -23,8 +23,8 @@ Pod::Spec.new do |s|
   # React Native IAP uses StoreKit 2 via OpenIAP, which requires iOS 15+.
   # Enforce this at the podspec level so projects with a lower deployment target
   # get a clear CocoaPods error instead of a vague SwiftCompile failure.
-  # Platform versions match OpenIAP requirements: iOS 15+, macOS 14+, tvOS 15+, watchOS 8+
-  s.platforms    = { :ios => '15.0', :tvos => '15.0', :macos => '14.0', :watchos => '8.0', :visionos => 1.0 }
+  # Platform versions match OpenIAP requirements: iOS 15+, macOS 14+, tvOS 16+, watchOS 8+
+  s.platforms    = { :ios => '15.0', :tvos => '16.0', :macos => '14.0', :watchos => '8.0', :visionos => 1.0 }
   s.source       = { :git => "https://github.com/hyochan/react-native-iap.git", :tag => "#{s.version}" }
 
   s.source_files = [