Bump etcd to 3.5.21

Author: seunghun1ee

etc/kayobe/kolla/kolla-build.conf

@@ -7,11 +7,15 @@ base_tag = noble-20241118.1
 {# 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 }}
-rpm_setup_config = 
+rpm_setup_config =
 {% endif %}
 build_args = {{ (kolla_build_args | default({})).items() | map('join', ':') | join(',') }}
 
 [openstack-base]
 type = git
 location = https://github.com/stackhpc/requirements
 reference = stackhpc/{{ openstack_release }}
+
+[etcd]
+version = 3.5.21
+sha256 = amd64:adddda4b06718e68671ffabff2f8cee48488ba61ad82900e639d108f2148501c,arm64:95bf6918623a097c0385b96f139d90248614485e781ec9bee4768dbb6c79c53f