Use stable constraint in tox to release Tempest new tag

We are going to release Tempest new tag which work with
the stable/2024.1 constraint so use that in the tox env.

For example: if anyone use Tempest new tag in future say
1 year later then tox env also should use the 2024.1 contstraint for
compatibility instead master.

These need to be move back to master constraint once release is done.

Change-Id: I4e8fe7650f088ecbbbb279c35f8931c71de4ece1
2 files changed