chore: Update changelog

Author: NickLarsenNZ

CHANGELOG.md

@@ -14,11 +14,13 @@
   Previously, arbitrary file names were silently accepted and ignored ([#751]).
 - Bump `stackable-operator` to 0.111.1 and snafu to 0.9 ([#751], [#752]).
 - 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]).
 
 [#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
 
 ## [26.3.0] - 2026-03-16