Update TOX_CONSTRAINTS_FILE for stable/2024.1

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/2024.1 branch, tests will
continue to use the upper-constraints list on master.

Change-Id: I15fbf8e92af713937fc3ff899671f70106b8b82f

Author: openstackadmin

tox.ini

@@ -13,7 +13,7 @@ setenv = OS_STDOUT_NOCAPTURE=False
 # first one that is defined. If none of them is defined, we fallback to the
 # default value.
 deps =
-       -c{env:TOX_CONSTRAINTS_FILE:{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}}
+       -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
@@ -67,7 +67,7 @@ basepython = python3
 # first one that is defined. If none of them is defined, we fallback to the
 # default value.
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/2024.1}
   -r{toxinidir}/doc/requirements.txt
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html