Fix RetryAutoConfiguration class condition

Changes the @ConditionalOnClass condition from RetryTemplate to RetryUtils to
ensure proper conditional loading of retry functionality. This prevents the
auto-configuration from being enabled when spring-retry is present but
spring-ai-retry is not, which was causing issues with modules like
spring-ai-azure-openai that don't include spring-ai-retry.

Author: zhaojy

spring-ai-spring-boot-autoconfigure/src/main/java/org/springframework/ai/autoconfigure/retry/SpringAiRetryAutoConfiguration.java

@@ -23,6 +23,7 @@
 import org.slf4j.LoggerFactory;
 
 import org.springframework.ai.retry.NonTransientAiException;
+import org.springframework.ai.retry.RetryUtils;
 import org.springframework.ai.retry.TransientAiException;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
@@ -43,7 +44,7 @@
  * @author Christian Tzolov
  */
 @AutoConfiguration
-@ConditionalOnClass(RetryTemplate.class)
+@ConditionalOnClass(RetryUtils.class)
 @EnableConfigurationProperties({ SpringAiRetryProperties.class })
 public class SpringAiRetryAutoConfiguration {