Update TOX_CONSTRAINTS_FILE for stable/2025.1

Update the URL to the upper-constraints file to point to the redirect
rule on releases.openstack.org so that anyone working on this branch
will switch to the correct upper-constraints list automatically when
the requirements repository branches.

Until the requirements repository has as stable/2025.1 branch, tests will
continue to use the upper-constraints list on master.

Change-Id: I12617d3fd08cce47144d4e9ad1e944d502ef4b9c

.gitreview

@@ -2,3 +2,4 @@
 host=review.opendev.org
 port=29418
 project=openstack/python-cloudkittyclient.git
+defaultbranch=stable/2025.1

.zuul.yaml

@@ -21,6 +21,8 @@
         cloudkitty: https://opendev.org/openstack/cloudkitty
       devstack_localrc:
         CLOUDKITTY_FETCHER: keystone
+        DEVSTACK_GATE_USE_PYTHON3: "True"
+        USE_PYTHON3: True
       devstack_services:
         ck-api: true
         horizon: false

releasenotes/source/2025.1.rst

@@ -1,6 +0,0 @@
-===========================
-2025.1 Series Release Notes
-===========================
-
-.. release-notes::
-   :branch: stable/2025.1

releasenotes/source/index.rst

@@ -8,7 +8,6 @@ Contents
    :maxdepth: 2
 
    unreleased
-   2025.1
    2024.2
    2024.1
    2023.2

tox.ini

@@ -73,7 +73,7 @@ commands = {posargs}
 
 [testenv:docs]
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build --keep-going -b html doc/source doc/build/html
 
@@ -98,7 +98,7 @@ import_exceptions = cloudkittyclient.i18n
 
 [testenv:releasenotes]
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2025.1}
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html