Add OpenAI TTS Voice

Author: hgs-study

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/api/OpenAiAudioApi.java

@@ -392,7 +392,13 @@ public enum Voice {
 			@JsonProperty("nova")
 			NOVA("nova"),
 			@JsonProperty("shimmer")
-			SHIMMER("shimmer");
+			SHIMMER("shimmer"),
+			@JsonProperty("sage")
+			SAGE("sage"),
+			@JsonProperty("coral")
+			CORAL("coral"),
+			@JsonProperty("ash")
+			ASH("ash");
 			// @formatter:on
 
 			public final String value;