Remove py from test-requirements.txt

[jelly]

py is in maintenance mode and nothing in this project depends on it.

What type of PR is this?

Fixes #2286

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Remove py from test dependencies

[linux-foundation-easycla]

• ✅login: jelly / (5939b73)

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[yliaog]

please sign cla

[jelly]

please sign cla

Done

[yliaog]

/lgtm
/approvev

[anandfresh]

/approve

[jelly]

Can this be merged?

[yliaog]

/approve

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