change: update unit tests for removing v1 format

tests/httpbin/upload.yml

@@ -1,8 +1,9 @@
-- config:
+config:
     name: test upload file with httpbin
     base_url: ${get_httpbin_server()}
 
-- test:
+teststeps:
+-
     name: upload file
     variables:
         file_path: "data/test.env"
@@ -17,7 +18,7 @@
         - eq: ["status_code", 200]
         - startswith: ["content.files.file", "UserName=test"]
 
-- test:
+-
     name: upload file with keyword
     request:
         url: /post