Drop Python 3.9 support

It was removed from tested runtimes in 2025.2 . It has been kept for
one cycle for smooth transition of the other projects, but it's time
to bump the enforced minimum requirement.

Also add Python 3.13 which has been tested for some time.

Change-Id: I357f6af4d6079f4e0f66f4b3736fa548e5a9575c
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

.zuul.yaml

@@ -9,13 +9,13 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - openstack-tox-functional-py39
+        - openstack-tox-functional-py310
         - openstack-tox-functional-py312
         - tempest-smoke-py3-osprofiler-redis
         - tempest-smoke-py3-osprofiler-sqlalchemy
     gate:
       jobs:
-        - openstack-tox-functional-py39
+        - openstack-tox-functional-py310
 
 - job:
     name: tempest-smoke-py3-osprofiler-redis

releasenotes/notes/remove-py39-d5921efb33a278ca.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Support for Python 3.9 has been removed. Now the minimum python version
+    supported is 3.10.

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/osprofiler/latest/
-python_requires = >=3.9
+python_requires = >=3.10
 classifier =
     Environment :: OpenStack
     Intended Audience :: Developers
@@ -15,10 +15,10 @@ classifier =
     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
+    Programming Language :: Python :: 3.13
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython