Update CHANGELOG for dpnp.linalg.lu_factor (#2569)

This PR updates changelog by adding entries for `dpnp.linalg.lu_factor`.

Author: vlad-perevezentsev

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added `timeout-minutes` property to GitHub jobs [#2526](https://github.com/IntelPython/dpnp/pull/2526)
 * Added implementation of `dpnp.ndarray.data` and `dpnp.ndarray.data.ptr` attributes [#2521](https://github.com/IntelPython/dpnp/pull/2521)
 * Added `dpnp.ndarray.__contains__` method [#2534](https://github.com/IntelPython/dpnp/pull/2534)
+* Added implementation of `dpnp.linalg.lu_factor` (SciPy-compatible) [#2557](https://github.com/IntelPython/dpnp/pull/2557), [#2565](https://github.com/IntelPython/dpnp/pull/2565)
 
 ### Changed