docs: adding redis_version to AA db datasource docs

Author: burythehammer

docs/data-sources/rediscloud_active_active_subscription_database.md

@@ -45,6 +45,7 @@ data "rediscloud_active_active_subscription_database" "example" {
 * `memory_limit_in_gb` - The maximum memory usage for the database.
 * `dataset_size_in_gb` - Maximum amount of data in the dataset for this specific database in GB.
 * `support_oss_cluster_api` - Supports the Redis open-source (OSS) Cluster API.
+* `redis_version` - The Redis version of the database.
 * `external_endpoint_for_oss_cluster_api` - Use the external endpoint for open-source (OSS) Cluster API.
 * `enable_tls` - Enable TLS for database.
 * `tls_certificate` - TLS certificate used for authentication.