Merge pull request #26 from zilliztech/dev

upgrade java sdk to milvus 2.4.1

Author: nianliuu

pom.xml

@@ -41,7 +41,7 @@
         <dependency>
         <groupId>io.milvus</groupId>
         <artifactId>milvus-sdk-java</artifactId>
-        <version>2.3.1</version>
+        <version>2.4.1</version>
         </dependency>
         <dependency>
             <groupId>junit</groupId>