Make sqlalchemy-2x job voting again

... because the new oslo.utils version is now used in CI.

Depends-on: https://review.opendev.org/c/openstack/requirements/+/900517
Related-Bug: #2042886
Change-Id: I916a2b64d8d611f0e2bd4583bbe68fdc3bd00511

Author: kajinamit

.zuul.yaml

@@ -36,8 +36,6 @@
       Takes advantage of the base tox job's install-siblings feature.
     # The job only tests the latest and shouldn't be run on the stable branches
     branches: ^master$
-    # TODO(tkajinam): Make this voting once oslo.utils is bumped to 6.3.0
-    voting: false
     required-projects:
       - name: github.com/sqlalchemy/sqlalchemy
         override-checkout: main