Updated CHANGELOG.md for release 2.70.3 (#6631)

Author: galvana

CHANGELOG.md

@@ -19,7 +19,7 @@ Changes can also be flagged with a GitHub label for tracking purposes. The URL o
 - https://github.com/ethyca/fides/labels/high-risk: to indicate that a change is a "high-risk" change that could potentially lead to unanticipated regressions or degradations
 - https://github.com/ethyca/fides/labels/db-migration: to indicate that a given change includes a DB migration
 
-## [Unreleased](https://github.com/ethyca/fides/compare/2.70.2...main)
+## [Unreleased](https://github.com/ethyca/fides/compare/2.70.3...main)
 
 ### Added
 - Added SRV and SSL support for MongoDB [#6590](https://github.com/ethyca/fides/pull/6590)