Explicitly set python 3.12 for noble

Author: seunghun1ee

etc/kayobe/kolla/kolla-build.conf

@@ -6,6 +6,7 @@
 base_tag = jammy-20240808
 {% elif kolla_base_distro == 'ubuntu' and kolla_base_distro_version == 'noble' %}
 base_tag = noble-20250127
+distro_python_version = 3.12
 {# Similarly pinning to Rocky 9 minor version used in our repos #}
 {% elif kolla_base_distro == 'rocky' %}
 base_tag = 9.{{ stackhpc_pulp_repo_rocky_9_minor_version }}