Update antora.yml and change log

Author: Emrehzl94

antora.yml

@@ -12,7 +12,7 @@ asciidoc:
     page-product: Neo4j Connector for Kafka
     kafka-connect-version: 3.0
     connector-version: '5.1'
-    exact-connector-version: '5.1.1'
+    exact-connector-version: '5.1.2'
     page-pagination: true
     product-name: Neo4j Connector for Kafka
     url-common-license-page: https://neo4j.com/docs/license/

modules/ROOT/pages/changelog.adoc

@@ -2,6 +2,23 @@
 
 This page lists changes to the {product-name}.
 
+== Version 5.1.2
+
+=== New and updated features
+
+[cols="2",options="header"]
+|===
+| Feature
+| Details
+
+a|
+label:fix[]
+
+Support JSON strings with JsonConverter when schemas are not enabled
+a|Resolved an issue with the `org.apache.kafka.connect.json.JsonConverter` where it did not support JSON strings when `schemas.enable=false`. The connector now correctly handles incoming JSON strings without requiring schema definitions.
+
+|===
+
 == Version 5.1.1
 
 === New and updated features