Remove information about base image

This base image has been changed by introducing another release.

Author: sachilles

Changelog.md

@@ -3,11 +3,10 @@
 This file only reflects the changes that are made in this image. Please refer to the upstream GitLab [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-foss/blob/master/CHANGELOG.md) for the list of changes in GitLab.
 
 **14.9.0**
-- gitlab: upgrade CE to v14.9.0 - https://about.gitlab.com/releases/2022/03/22/gitlab-14-9-released/
+- gitlab: upgrade CE to v14.9.0
 - gitaly: upgrade to v14.9.0
 - gitlab-pages: upgrade to v1.56.0
 - gitlab-shell: upgrade to v13.24.1
-- ubuntu: upgrade to focal-20220316
 
 **14.8.4**
 - gitlab: upgrade CE to v14.8.4