Switch to the master constraint in tox.ini

To release a new tag for Tempest 2026.1, we modified the
compatible constraint in tox.in

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

Change-Id: I132a63b5cecba9fc0af388851fff73e1cc546781
Signed-off-by: Ghanshyam Maan <gmaan.os14@gmail.com>
2 files changed