[tests] bump devstack branch to stable/2023.2, fix python issues

[kayrus]

What this PR does / why we need it:

the stable/2023.1 was removed in some openstack repos, now the stable/2023.2 is the stable one. also we need to update pip and setuptools

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:

Release note:

NONE

[kayrus]

@zetaab @dulek ready for review

[mnasiadka]

Why not 2024.1? Given 2023.2 is non-slurp - most people probably will use 2024.1

[dulek]

/approved
/lgtm

[kayrus]

Why not 2024.1? Given 2023.2 is non-slurp - most people probably will use 2024.1

I already spent an evening trying to fix the tests, don't want to invest more time. Feel free to submit a new PR.

@dulek /approve, not /approved

[zetaab]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zetaab

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[kayrus]

/cherry-pick release-1.29

[k8s-infra-cherrypick-robot]

@kayrus: new pull request created: #2740

In response to this:

/cherry-pick release-1.29

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