Bump prometheus images for Caracal

Bumped prometheus server from 2.50.1 to 2.54.1

Bumped prometheus-memcached-exporter from 0.14.2 to 0.14.4

Author: seunghun1ee

etc/kayobe/kolla-image-tags.yml

@@ -11,3 +11,6 @@ kolla_image_tags:
     ubuntu-jammy: 2024.1-ubuntu-jammy-20240805T142526
   bifrost_deploy:
     rocky-9: 2024.1-rocky-9-20240725T165045
+  prometheus:
+    rocky-9: 2024.1-rocky-9-20240909T143450
+    ubuntu-jammy: 2024.1-ubuntu-jammy-20240909T143450