Libraries should support newer python versions before these are supported by the services. Add the new job template to enable testing of available newer versions. At this moment the template makes Python 3.14 job voting, and adds non-voting Python 3.15 job. Change-Id: Id7aff44ca8a511d39ae945c43291fa21a929713a Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>