Add compatibility note to the changelog

Author: antonwolfy

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.21.0] - MM/DD/2026
 
+This release is compatible with NumPy 2.4.5.
+
 ### Added
 
 * Added C API functions for `dpnp.tensor.usm_ndarray` setters and getters to avoid ABI breakage if `dpnp.tensor.usm_ndarray` is modified [gh-2866](https://github.com/IntelPython/dpnp/pull/2866)