(PE-38111) Update changelog to match the release-prep script

 - The release-prep script auto-generates the changelog.
 - Currently, there is a check in the release action that the auto-generated changelog must match what is inside CHANGELOG.md.
 - Updating the CHANGELOG.md file so that the release action passes that check.

CHANGELOG.md

@@ -1,8 +1,8 @@
 # Changelog
 
-## [3.0.1](https://github.com/puppetlabs/beaker-pe/tree/3.0.1) (2024-04-08)
+## [2.16.1](https://github.com/puppetlabs/beaker-pe/tree/2.16.1) (2024-03-19)
 
-[Full Changelog](https://github.com/puppetlabs/beaker-pe/compare/3.0.0...3.0.1)
+[Full Changelog](https://github.com/puppetlabs/beaker-pe/compare/3.0.0...2.16.1)
 
 **Implemented enhancements:**