Refresh onfido-python after onfido-openapi-spec update (6d0dfd9)

[devops-automation-onfido]

Auto-generated PR with changes till commit onfido/onfido-openapi-spec@6d0dfd9 (included)

Additional changes:

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[kigawas]

Why virtualenv is a dependency but not a dev-dependency?

[dvacca-onfido]

Why virtualenv is a dependency but not a dev-dependency?

@kigawas Good catch, thanks for flagging this! virtualenv was added to pin a minimum version addressing a known vulnerability (it's a transitive dependency of tox, which we use for testing). However, you're right — it shouldn't be a runtime dependency of this library. We're removing it entirely since it's already pulled in transitively by our dev tooling (see onfido/onfido-openapi-spec#229). Fix coming in the next release.