Remove python 3.9 support

OpenStack recently dropped python3.9 support for global requirements[1]
as it was removed from the Flamingo supported runtimes[2].

So this patch removes 3.9 support from nova too.

[1]https://review.opendev.org/c/openstack/requirements/+/948285
[2]https://governance.openstack.org/tc/reference/runtimes/2025.2.html#python

Change-Id: I8aea971d7972959c32d5175926cbaddb21839f8e

.zuul.yaml

@@ -1,34 +1,6 @@
 # See https://docs.openstack.org/infra/manual/drivers.html#naming-with-zuul-v3
 # for job naming conventions.
 
-- job:
-    name: nova-tox-functional-py39
-    parent: openstack-tox-functional-py39
-    description: |
-      Run tox-based functional tests for the OpenStack Nova project
-      under cPython version 3.9 with Nova specific irrelevant-files list.
-      Uses tox with the ``functional-py39`` environment.
-
-      This job also provides a parent for other projects to run the nova
-      functional tests on their own changes.
-    required-projects:
-      # including nova here makes this job reusable by other projects
-      - openstack/nova
-      - openstack/placement
-    irrelevant-files: &functional-irrelevant-files
-      - ^.*\.rst$
-      - ^api-.*$
-      - ^doc/(source|test)/.*$
-      - ^nova/locale/.*$
-      - ^\.pre-commit-config\.yaml$
-      - ^releasenotes/.*$
-    vars:
-      # explicitly stating the work dir makes this job reusable by other
-      # projects
-      zuul_work_dir: src/opendev.org/openstack/nova
-      bindep_profile: test py39
-    timeout: 3600
-
 - job:
     name: nova-tox-functional-py310
     parent: openstack-tox-functional-py310
@@ -43,7 +15,13 @@
       # including nova here makes this job reusable by other projects
       - openstack/nova
       - openstack/placement
-    irrelevant-files: *functional-irrelevant-files
+    irrelevant-files: &functional-irrelevant-files
+      - ^.*\.rst$
+      - ^api-.*$
+      - ^doc/(source|test)/.*$
+      - ^nova/locale/.*$
+      - ^\.pre-commit-config\.yaml$
+      - ^releasenotes/.*$
     vars:
       # explicitly stating the work dir makes this job reusable by other
       # projects
@@ -809,7 +787,6 @@
         - nova-ovs-hybrid-plug
         - nova-tox-validate-backport:
             voting: false
-        - nova-tox-functional-py39
         - nova-tox-functional-py310
         - nova-tox-functional-py312
         - openstack-tox-py312:
@@ -837,7 +814,6 @@
     gate:
       jobs:
         - nova-live-migration
-        - nova-tox-functional-py39
         - nova-tox-functional-py310
         - nova-tox-functional-py312
         - nova-multi-cell

setup.cfg

@@ -10,7 +10,7 @@ project_urls =
     Bug Tracker = https://bugs.launchpad.net/nova/
     Documentation = https://docs.openstack.org/nova/
     Source Code = https://opendev.org/openstack/nova
-python_requires = >=3.9
+python_requires = >=3.10
 classifiers =
     Development Status :: 5 - Production/Stable
     Environment :: OpenStack
@@ -20,7 +20,6 @@ classifiers =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12

tox.ini

@@ -53,14 +53,14 @@ commands =
   env TEST_OSPROFILER=1 stestr run --combine --no-discover 'nova.tests.unit.test_profiler'
   stestr slowest
 
-[testenv:{unit,py3,py39,py310,py311,py312}]
+[testenv:{unit,py3,py310,py311,py312}]
 setenv =
   {[testenv]setenv}
 # we do not have any greenlet leaks in unit tests so enforce that
 # by making greenlet leaks a failure.
   NOVA_RAISE_ON_GREENLET_LEAK=True
 
-[testenv:functional{,-py39,-py310,-py311,-py312}]
+[testenv:functional{,-py310,-py311,-py312}]
 description =
   Run functional tests.
 setenv =