fix: upgrade junit:junit from 4.9 to 4.13 (#1338)

Snyk has created this PR to upgrade junit:junit from 4.9 to 4.13.

See this package in NPM:
https://www.npmjs.com/package/junit:junit

See this project in Snyk:
https://app.snyk.io/org/cxie/project/2f701ce6-b421-4bbf-aaad-9d2bdb8569e4?utm_source=github&utm_medium=upgrade-prSigned-off-by: NJinHai-CN <hai.jin@zilliz.com>

tests/milvus-java-test/pom.xml

@@ -87,7 +87,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.9</version>
+            <version>4.13</version>
         </dependency>
 
 <!--        <dependency>-->