chore: Add changelog entry

Author: Techassi

crates/stackable-versioned/CHANGELOG.md

@@ -13,11 +13,14 @@ All notable changes to this project will be documented in this file.
 
 ### Changed
 
+- BREAKING: The `merged_crd` function now accepts `Self` instead of a dedicated
+  `Version` enu ([#875]).
 - The `merged_crd` associated function now takes `Version` instead of `&str` as
   input ([#872]).
 
 [#872]: https://github.com/stackabletech/operator-rs/pull/872
 [#873]: https://github.com/stackabletech/operator-rs/pull/873
+[#875]: https://github.com/stackabletech/operator-rs/pull/875
 
 ## [0.2.0] - 2024-09-19