Only support Python 3.11

To match Zuul, update the pypi classifiers and testing to indicate
that only Python 3.11 is tested and supported.

Change-Id: Id7d422aaae94961a7ee746e7c69308f04d94954d
Depends-On: https://review.opendev.org/891339

.zuul.yaml

@@ -6,7 +6,7 @@
     run: playbooks/nodepool-functional-k8s/run.yaml
     required-projects:
       - zuul/nodepool
-    nodeset: ubuntu-jammy
+    nodeset: debian-bookworm
 
 - job:
     description: |
@@ -249,25 +249,17 @@
         env-vars:
           DIB_SIMPLE_INIT_NETWORKMANAGER: '1'
 
-- job:
-    name: nodepool-nox-py38
-    description: |
-      Nodepool unit tests with ZooKeeper running
-    parent: nox-py38
-    pre-run: playbooks/nodepool-nox/pre.yaml
-    vars: &nodepool_nox_vars
-      nox_environment:
-        NODEPOOL_ZK_CA: /opt/zookeeper/ca/certs/cacert.pem
-        NODEPOOL_ZK_CERT: /opt/zookeeper/ca/certs/client.pem
-        NODEPOOL_ZK_KEY: /opt/zookeeper/ca/keys/clientkey.pem
-
 - job:
     name: nodepool-nox-py311
     description: |
       Nodepool unit tests with ZooKeeper running
     parent: nox-py311
     pre-run: playbooks/nodepool-nox/pre.yaml
-    vars: *nodepool_nox_vars
+    vars:
+      nox_environment:
+        NODEPOOL_ZK_CA: /opt/zookeeper/ca/certs/cacert.pem
+        NODEPOOL_ZK_CERT: /opt/zookeeper/ca/certs/client.pem
+        NODEPOOL_ZK_KEY: /opt/zookeeper/ca/keys/clientkey.pem
     nodeset: ubuntu-jammy
 
 - project:
@@ -278,10 +270,12 @@
       jobs:
         - opendev-buildset-registry
         - nodepool-build-image
-        - zuul-nox-docs
-        - nox-linters
-        - nodepool-nox-py38:
-            nodeset: ubuntu-focal
+        - zuul-nox-docs:
+            vars:
+              nox_force_python: "3.11"
+              python_version: "3.11"
+        - nox-linters:
+            nodeset: ubuntu-jammy
         - nodepool-nox-py311
         - nodepool-functional-container-openstack-release
         - nodepool-functional-k8s
@@ -293,10 +287,12 @@
     gate:
       jobs:
         - nodepool-upload-image
-        - zuul-nox-docs
-        - nox-linters
-        - nodepool-nox-py38:
-            nodeset: ubuntu-focal
+        - zuul-nox-docs:
+            vars:
+              nox_force_python: "3.11"
+              python_version: "3.11"
+        - nox-linters:
+            nodeset: ubuntu-jammy
         - nodepool-nox-py311
         - nodepool-functional-k8s
         - nodepool-functional-openshift

releasenotes/notes/python-311-cdd62c3138869c4b.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 3.11 is now the only version of Python with which Nodepool is
+    tested.

setup.cfg

@@ -6,17 +6,13 @@ description-file =
 author = Zuul Team
 author-email = zuul-discuss@lists.zuul-ci.org
 home-page = https://zuul-ci.org/
-python-requires = >= 3.8
+python-requires = >= 3.11
 classifier =
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
     Programming Language :: Python
-    Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
 
 [pbr]