Bump io.minio:minio from 8.4.1 to 8.6.0 in /tests/milvustest (#1635)

Bumps [io.minio:minio](https://github.com/minio/minio-java) from 8.4.1 to 8.6.0.
- [Release notes](https://github.com/minio/minio-java/releases)
- [Commits](minio/minio-java@8.4.1...8.6.0)

---
updated-dependencies:
- dependency-name: io.minio:minio
  dependency-version: 8.6.0
  dependency-type: direct:production
...

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tests/milvustest/pom.xml

@@ -121,7 +121,7 @@
         <dependency>
             <groupId>io.minio</groupId>
             <artifactId>minio</artifactId>
-            <version>8.4.1</version>
+            <version>8.6.0</version>
         </dependency>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>