updated changelog for 2.28.3

services/horizon/CHANGELOG.md

@@ -5,6 +5,9 @@ file. This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## 2.28.3
 
+### Fixed
+- Fix claimable_balance_claimants subquery in GetClaimableBalances() [5207](https://github.com/stellar/go/pull/5207)
+
 ### Added
 - New optional config `SKIP_TXMETA` ([5189](https://github.com/stellar/go/issues/5189)). Defaults to `FALSE`, when `TRUE` the following will occur:
   * history_transactions.tx_meta column will have serialized xdr that equates to empty for any protocol version, such as for `xdr.TransactionMeta.V3`, `Operations`, `TxChangesAfter`, `TxChangesBefore` will be empty arrays and `SorobanMeta` will be nil.