Updated release & readme to refer to new Spark version

Author: pravinbhat

README.md

@@ -7,7 +7,7 @@
 
 Migrate and Validate Tables between Origin and Target Cassandra Clusters.
 
-> :warning: Please note this job has been tested with spark version [3.5.1](https://archive.apache.org/dist/spark/spark-3.5.1/)
+> :warning: Please note this job has been tested with spark version [3.5.2](https://archive.apache.org/dist/spark/spark-3.5.2/)
 
 ## Install as a Container
 - Get the latest image that includes all dependencies from [DockerHub](https://hub.docker.com/r/datastax/cassandra-data-migrator)

RELEASE.md

@@ -1,6 +1,7 @@
 # Release Notes
 ## [4.3.5] - 2024-08-23
 - Added feature `spark.cdm.feature.extractJson` which allows you to extract a json value from a column with json content in an Origin table and map it to a column in the Target table.
+- Upgraded to use Spark `3.5.2`.
 
 ## [4.3.4] - 2024-07-31
 - Use `spark.cdm.schema.origin.keyspaceTable` when `spark.cdm.schema.target.keyspaceTable` is missing. Fixes [bug introduced in prior version](https://github.com/datastax/cassandra-data-migrator/issues/284).