test: install pip deps during setup

[thisislawatts]

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What does this PR do?

Follow up from @mcombuechen by explicitly installing the Python deps.

Why? Introducing a new acceptance test can affect the way in which tests are distributed across our parallel runners. As a result we (re)discovered a test suite which relies on deps being available without first installing them.
https://app.circleci.com/pipelines/github/snyk/cli/21608/workflows/fe848f99-2bfe-4543-8c48-93e5ee24fafa/jobs/322218/tests

[cmars]

How do we know pip is installed?

[thisislawatts]

At the moment pip is being installed as part of the machine setup, either using homebrew or chocolatey depending on the os.

Example: https://github.com/snyk/cli/blob/feat/parse-workflow-data-to-determine-errors/.circleci/chocolatey.config#L9