remove collectd bump

Author: bwestover

data/release-notes/enterprise-server/3-1/12.yml

@@ -11,7 +11,6 @@ sections:
     - Some critical services may not have been available on backend nodes in GHES Cluster.
   changes:
     - An additional outer layer of `gzip` compression when creating a cluster support bundle with `ghe-cluster-suport-bundle` is now turned off by default. This outer compression can optionally be applied with the `ghe-cluster-suport-bundle -c` command line option.
-    - Upgraded collectd to version 5.12.0.
     - We have added extra text to the admin console to remind users about the mobile apps' data collection for experience improvement purposes.
   known_issues:
     - The {% data variables.product.prodname_registry %} npm registry no longer returns a time value in metadata responses. This was done to allow for substantial performance improvements. We continue to have all the data necessary to return a time value as part of the metadata response and will resume returning this value in the future once we have solved the existing performance issues.