Add openstack-python3-next-jobs

Client libraries should support newer versions before these versions
are supported by services.

Add the new job template to enable early testing of newer python
versions so that we can catch compatibility problems earlier.

Change-Id: I9bbf6478b4e9a1a0bb16e145fb04934c037807a8
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

Author: kajinamit

.zuul.yaml

@@ -32,6 +32,7 @@
     queue: telemetry
     templates:
       - openstack-python3-jobs
+      - openstack-python3-next-jobs
       - publish-openstack-docs-pti
       - check-requirements
       - release-notes-jobs-python3

pyproject.toml

@@ -26,6 +26,7 @@ classifiers = [
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
   "Programming Language :: Python :: 3 :: Only",
 ]