Terraform fix

Author: stevebux

infrastructure/terraform/components/api/module_lambda_letter_updates_transformer.tf

@@ -57,7 +57,7 @@ data "aws_iam_policy_document" "letter_updates_transformer_lambda" {
 
 resource "aws_lambda_event_source_mapping" "letter_updates_transformer_kinesis" {
   event_source_arn                     = aws_kinesis_stream.letter_change_stream.arn
-  function_name                        = module.letter_stream_handler_lambda.lambda_function_name
+  function_name                        = module.letter_updates_transformer_lambda.lambda_function_name
   starting_position                    = "LATEST"
   batch_size                           = 10
   maximum_batching_window_in_seconds   = 1