Update zuul queue configuration

Zuul changed the way in which queues have to be declared [1][2].
We'll update the os-win zuul configuration accordingly.

We're also updating the sphinx requirement to match the one
from the global requirements file, otherwise the requirements job
fails.

[1] https://lists.zuul-ci.org/pipermail/zuul-discuss/2022-May/001801.html
[2] https://lists.openstack.org/pipermail/openstack-discuss/2022-May/028603.html

Change-Id: I9b443aba106df12de5a8d215a0d88843bfecddf7
(cherry picked from commit e18d57e319)

.zuul.yaml

@@ -4,5 +4,4 @@
       - openstack-python35-jobs
       - check-requirements
       - release-notes-jobs
-    gate:
-      queue: os-win
+    queue: os-win

test-requirements.txt

@@ -8,7 +8,8 @@ coverage!=4.4,>=4.0 # Apache-2.0
 ddt>=1.0.1 # MIT
 python-subunit>=1.0.0 # Apache-2.0/BSD
 docutils>=0.11 # OSI-Approved Open Source, Public Domain
-sphinx!=1.6.6,>=1.6.2 # BSD
+sphinx>=1.6.2,!=1.6.6,<2.0.0;python_version=='2.7'  # BSD
+sphinx>=1.6.2,!=1.6.6;python_version>='3.4'  # BSD
 oslo.config>=5.1.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD