Updated release notes

Signed-off-by: Elena Khaustova <[email protected]>

RELEASE.md

@@ -5,6 +5,7 @@
 * Added `Pipeline.grouped_nodes_by_namespace` property which returns a dictionary of nodes grouped by namespace, intended to be used by plugins to facilitate deployment of namespaced nodes together.
 
 ## Bug fixes and other changes
+* Added `DataCatalog` deprecation warning.
 * Updated `_LazyDataset` representation when printing `KedroDataCatalog`.
 * Fixed `MemoryDataset` to infer `assign` copy mode for Ibis Tables, which previously would be inferred as `deepcopy`.
 ## Breaking changes to the API