Merge pull request #75 from milvus-io/dependabot/pip/tests/milvus_benchmark/pyyaml-5.1

Bump pyyaml from 3.12 to 5.1 in /tests/milvus_benchmark

Former-commit-id: cac93c407332d1e62fa8c79bb6119c79d6d93efe

tests/milvus_benchmark/requirements.txt

 numpy==1.16.3
 pymilvus>=0.1.18
-pyyaml==3.12
+pyyaml==5.1
 docker==4.0.2
 tableprint==0.8.0
 ansicolors==1.1.8
\ No newline at end of file