(maint) add changelog entry

The change version specified to `puppetlabs-postgresql` will cause
the module to install and manage postgres 14 by default.

Author: jonathannewman

CHANGELOG.md

@@ -6,6 +6,8 @@ Release notes for the puppetlabs-puppetdb module.
 * Drop support for Puppet 6
 * Drop support for Ubuntu 16.04 and Scientific Linux 7
 * Remove all code related to embedded database
+* Require and install postgres 14 by default
+
 
 #### 7.14.0 - 2023/10/09
 * Owner of puppetdb config.ini is now root