Update Changelog.md

Author: Maleware

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Added
 
 - BREAKING: Add required CLI argument and env var to set the image repository used to construct final product image names: `IMAGE_REPOSITORY` (`--image-repository`), eg. `oci.example.org/my/namespace` ([#752]).
+- Add support for HBase 2.6.6 (as LTS) ([#767]).
 
 ### Changed
 
@@ -16,11 +17,16 @@
 - Internal operator refactoring: introduce dereference() and validate() steps in the reconciler ([#757]).
 - test: Bump vector-aggregator to 0.55.0, replace /graphql call with gRPC call ([#762]).
 
+### Removed
+
+- Remove support for 2.6.3 ([#767]).
+
 [#745]: https://github.com/stackabletech/hbase-operator/pull/745
 [#751]: https://github.com/stackabletech/hbase-operator/pull/751
 [#752]: https://github.com/stackabletech/hbase-operator/pull/752
 [#757]: https://github.com/stackabletech/hbase-operator/pull/757
 [#762]: https://github.com/stackabletech/hbase-operator/pull/762
+[#767]: https://github.com/stackabletech/hbase-operator/pull/767
 
 ## [26.3.0] - 2026-03-16