Remove SQLAlchemy tips jobs

The most recent SQLAlchemy and Alembic versions are now in
upper-constraints. As a result, this job has served its purpose and can
be removed. For more information, see [1].

[1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/thread/RBHXHTO3GUOOXVSZXD4C2O3TKDOH2QSC/

Change-Id: Iffef1b60bc3eb02fed70e8274d47eb1bc276f85e
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Depends-on: https://review.opendev.org/c/openstack/requirements/+/879743

.zuul.yaml

@@ -18,7 +18,6 @@
         - openstack-tox-functional-py38
         - openstack-tox-functional-py39
         - openstack-tox-pep8
-        - placement-tox-py310-with-sqlalchemy-2x
         - placement-nova-tox-functional-py39
         - placement-nested-perfload:
             voting: false
@@ -72,21 +71,6 @@
         - placement-nova-tox-functional-py39
         - tempest-integrated-placement
 
-- job:
-    name: placement-tox-py310-with-sqlalchemy-2x
-    parent: openstack-tox-py310
-    description: |
-      Run unit tests with main branch of SQLAlchemy, alembic and oslo.db.
-      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
-    required-projects:
-      - name: github.com/sqlalchemy/sqlalchemy
-        override-checkout: main
-      - name: github.com/sqlalchemy/alembic
-        override-checkout: main
-      - name: openstack/oslo.db
-
 - job:
     name: placement-nova-tox-functional-py39
     parent: nova-tox-functional-py39