Switch to the master constraint in tox.ini

To releas a new tag for Tempest 2024.1, we modified the
compatible constraint in tox.ini
- https://review.opendev.org/c/openstack/tempest/+/913950/

As new tag is released now so we can switch back to the master
constraint in tox.ini.

Change-Id: I1ec341903929f240ef3e796ee0db2acda9af9823
2 files changed