Remove stable/2023.1 job from master gate

stable/2023.1 is planned to be in unmaintained state[1]
and with python 3.8 drop from Tempest[2], we have to pin the
Tempest for stable/2023.1 testing[3]. This means Tempest and
its plugin master does not need to support stable/2023.1.

With that we can remove the stable/2023.1 jobs from tempest
plugin master jobs.

[1] https://lists.openstack.org/archives/list/openstack-discuss@>
[2] https://review.opendev.org/c/openstack/tempest/+/933398
[3] https://review.opendev.org/c/openstack/devstack/+/933704

Change-Id: Ib50784829daa5774e0f6603e0c10909d21ce5949
diff --git a/.zuul.yaml b/.zuul.yaml
index 883d90e..5701479 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -16,12 +16,6 @@
     nodeset: openstack-single-node-jammy
     override-checkout: stable/2023.2
 
-- job:
-    name: heat-functional-2023-1
-    parent: heat-functional
-    nodeset: openstack-single-node-jammy
-    override-checkout: stable/2023.1
-
 - project:
     queue: heat
     templates:
@@ -34,7 +28,6 @@
         - heat-functional-2024-2
         - heat-functional-2024-1
         - heat-functional-2023-2
-        - heat-functional-2023-1
     gate:
       jobs:
         - heat-functional