update .prow.yaml

[goern]

Committed via https://github.com/asottile/all-repos

[op1st-prow]

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[goern]

/test all

[op1st-prow]

@goern: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
op1st/prow/mypy	832ae6c	link	true	/test thoth-mypy-py38

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