Update changelog for v1.14.0

CHANGELOG/CHANGELOG-1.14.md

@@ -13,7 +13,8 @@ Changelog for the K8ssandra Operator, new PRs should update the `unreleased` sec
 
 When cutting a new release, update the `unreleased` heading to the tag being generated and date, like `## vX.Y.Z - YYYY-MM-DD` and create a new placeholder section for  `unreleased` entries.
 
-## unreleased
+## v1.14.0 - 2024-04-02
+
 * [FEATURE] [#1242](https://github.com/k8ssandra/k8ssandra-operator/issues/1242) Allow for creation of replicated secrets with a prefix, so that we can distinguish between multiple secrets with the same origin but targeting different clusters.
 * [BUGFIX] [#1226](https://github.com/k8ssandra/k8ssandra-operator/issues/1226) Medusa purge cronjob should be created in the operator namespace
 * [BUGFIX] [#1141](https://github.com/k8ssandra/k8ssandra-operator/issues/1141) Use DC name override when naming secondary resources