tests: bump devstack to stable/2025.2

[kayrus]

What this PR does / why we need it:

bump devstack version

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

Special notes for reviewers:

Release note:

NONE

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[kayrus]

the https://review.opendev.org/c/openstack/python-octaviaclient/+/948981 changed the tags output format

[kayrus]

@dulek @stephenfin @zetaab please approve

[stephenfin]

Looks good, however, I believe we can also stop setting device_detach_timeout (which we first started setting when we last bumped the branch) since that is fixed on this branch. Can we do that here?

[kayrus]

since that is fixed on this branch

it was fixed? I don't see a corresponding patch in https://bugs.launchpad.net/nova/+bug/2119114