chore: update changelog for 2023.04 patch (#129)

CHANGELOG.md

@@ -6,6 +6,13 @@ and this project uses `yyyy.rr[.pp]`, where `yyyy` is the year a patch is releas
 `rr` is a sequential release number (starting from `01`), and an optional two-digit
 sequential patch number (starting from `01`).
 
+## [2023.04.01] - 2024-06-20
+### Fixed
+- SIMPLE COUPLER: Fixed issue where the `anom_sst` value used was not the correct value read in from the namelist. (#122)
+
+### Tag Commit Hashes
+- 2023.04 6b4f8b5207483eb7a7839a29909a415253a05db8
+
 ## [2023.04] - 2023-12-04
 ### Added
 - Adds additional output arguments `thv_atm` amd `thv_surf` to the `surface_flux` interface, as well as calls to xgrid and send data in order to use a new atmosphere boundary layer scheme.