delete un unused package

Author: zxuexingzhijie

spring-ai-alibaba-data-agent-management/src/main/java/com/alibaba/cloud/ai/service/AnalyticDbVectorStoreManagementService.java

@@ -36,7 +36,6 @@
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.core.JsonProcessingException;
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.commons.collections.CollectionUtils;
 import org.springframework.ai.document.Document;
 import org.springframework.ai.embedding.EmbeddingModel;