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@lists.openstack.org/message/UDQAC7SR5JAQJE5WBAG54A2MTBVBTJ44/
[2] https://review.opendev.org/c/openstack/tempest/+/933398
[3] https://review.opendev.org/c/openstack/devstack/+/933704

Change-Id: I5bf0f619a1b72aed02ab5471a1a815d22d78b2df
diff --git a/.zuul.yaml b/.zuul.yaml
index 7351166..2c2eea4 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -46,7 +46,6 @@
         - keystone-dsvm-py3-functional-federation-ubuntu-jammy-k2k
         - keystone-dsvm-py3-functional-2024-1
         - keystone-dsvm-py3-functional-2023-2
-        - keystone-dsvm-py3-functional-2023-1
         - keystone-protection-functional
     gate:
       jobs:
@@ -65,9 +64,3 @@
     parent: keystone-dsvm-py3-functional
     nodeset: openstack-single-node-jammy
     override-checkout: stable/2023.2
-
-- job:
-    name: keystone-dsvm-py3-functional-2023-1
-    parent: keystone-dsvm-py3-functional
-    nodeset: openstack-single-node-jammy
-    override-checkout: stable/2023.1