🌱 E2E: Fix devstack by pinning pip

[lentzi90]

What this PR does / why we need it:

This is an attempt to get E2E back on track. I used copilot for this and have to verified yet if the changes makes sense.

/hold

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[k8s-ci-robot]

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[k8s-ci-robot]

@lentzi90: 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
pull-cluster-api-provider-openstack-e2e-test	70893f7	link	true	/test pull-cluster-api-provider-openstack-e2e-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[lentzi90]

This won't work.