Bump org.testng:testng from 7.4.0 to 7.5.1 in /tests/milvustestv2 (#782)

Bumps [org.testng:testng](https://github.com/cbeust/testng) from 7.4.0 to 7.5.1.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/testng-team/testng/blob/master/CHANGES.txt)
- [Commits](https://github.com/cbeust/testng/compare/7.4.0...7.5.1)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
...

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tests/milvustestv2/pom.xml

@@ -59,7 +59,7 @@
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
-            <version>7.4.0</version>
+            <version>7.5.1</version>
         </dependency>
         <dependency>
             <groupId>org.springframework</groupId>