update pytest version to 5.2.0

[tkng]

Motivation and Context

Recently, our automated tests are failed with an error message below:

TypeError: attrib() got an unexpected keyword argument 'convert'

@hadusam tought me that the version incompatibility between attrs and pytest causes this problem.

There're two solutions we can choose, 1st solution is downgrading of attrs, 2nd solution is upgrading pytest. I chose later.

see also: pytest-dev/pytest#3280

Description

just updated pytest version

How has this been tested?

unit test

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[hadusam]

Thanks for early fixing!
LGTM 👍