How do I authenticate to an external Confluent Schema Registry using Unity Catalog volumes in Databricks Runtime 14.3 LTS and above?
To authenticate to an external Confluent Schema Registry using Unity Catalog volumes in Databricks Runtime 14.3 LTS and above, you need to update your schema registry options according to the following example:

```python
schema_registry_options = {
    "schema.registry.subject" : "app-events-value",
    "schema.registry.address" : "https://remote-schema-registry-endpoint",
    "confluent.schema.registry.ssl.truststore.location" : "/Volumes/<catalog_name>/<schema_name>/<volume_name>/kafka.client.truststore.jks",
    "confluent.schema.registry.ssl.truststore.password" : "<password>",
    "confluent.schema.registry.ssl.keystore.location" : "/Volumes/<catalog_name>/<schema_name>/<volume_name>/kafka.client.keystore.jks",
    "confluent.schema.registry.ssl.keystore.password" : "<password>",
    "confluent.schema.registry.ssl.key.password" : "<password>"
}
```

Replace `<catalog_name>`, `<schema_name>`, `<volume_name>`, and `<password>` with the appropriate values for your setup. This configuration allows you to use truststore and keystore files in Unity Catalog volumes to authenticate to a Confluent Schema Registry.