Update changelog for 12.0.0

Author: kitchen-porter

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 This file is used to list changes made in the last 3 major versions of the postgresql cookbook.
 
-## Unreleased
+## 12.0.0 - *2024-11-05*
 
 - Remove support for Fedora
   Fedora is not an officially supported platform by the Sous Chefs community. If you would like to see Fedora support added back please open a PR to add it back.