prometheus: Drop some version overrides

Kolla has newer or equal versions for these now.

Author: markgoddard

etc/kayobe/kolla.yml

@@ -331,14 +331,8 @@ kolla_build_customizations: "{{ kolla_build_customizations_common | combine(koll
 
 # Dict mapping Kolla Dockerfile ARG names to their values.
 kolla_build_args:
-  blackbox_exporter_version: "0.19.0"
-  haproxy_exporter_version: "0.13.0"
-  memcached_exporter_version: "0.9.0"
-  mysqld_exporter_version: "0.13.0"
-  node_exporter_version: "1.5.0"
+  node_exporter_version: "1.5.0" # kolla has 1.4.0
   node_exporter_sha256sum: "af999fd31ab54ed3a34b9f0b10c28e9acee9ef5ac5a5d5edfdde85437db7acbb"
-  prometheus_version: "2.35.0"
-  prometheus_alertmanager_version: "0.24.0"
 
 ###############################################################################
 # Kolla-ansible inventory configuration.