fix(ClientListRelationsOptions): include headers when converting to ClientBatchCheckOptions

Author: ewanharris

src/main/java/dev/openfga/sdk/api/configuration/ClientListRelationsOptions.java

@@ -61,6 +61,7 @@ public ConsistencyPreference getConsistency() {
     public ClientBatchCheckClientOptions asClientBatchCheckClientOptions() {
         return new ClientBatchCheckClientOptions()
                 .authorizationModelId(authorizationModelId)
+                .additionalHeaders(additionalHeaders)
                 .maxParallelRequests(maxParallelRequests)
                 .consistency(consistency);
     }