Fix exception in OpenAiAudioTranscriptionResponseMetadata.toString (#3575)

Fixes: #3575

Auto-cherry-pick to 1.0.x

Signed-off-by: YunKui Lu <luyunkui95@gmail.com>

Author: YunKuiLu

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/metadata/audio/OpenAiAudioTranscriptionResponseMetadata.java

@@ -38,7 +38,7 @@ public class OpenAiAudioTranscriptionResponseMetadata extends AudioTranscription
 
 	};
 
-	protected static final String AI_METADATA_STRING = "{ @type: %1$s, rateLimit: %4$s }";
+	protected static final String AI_METADATA_STRING = "{ @type: %1$s, rateLimit: %2$s }";
 
 	@Nullable
 	private RateLimit rateLimit;