Add missing attr

Author: msluszniak

packages/react-native-executorch/common/rnexecutorch/models/speech_to_text/SpeechToText.h

@@ -20,8 +20,8 @@ class SpeechToText {
   [[nodiscard(
       "Registered non-void function")]] std::shared_ptr<OwningArrayBuffer>
   decode(std::span<int32_t> tokens, std::span<float> encoderOutput) const;
-  std::string transcribe(std::span<float> waveform,
-                         std::string languageOption) const;
+  [[nodiscard("Registered non-void function")]] std::string
+  transcribe(std::span<float> waveform, std::string languageOption) const;
 
   size_t getMemoryLowerBound() const noexcept;