[PRMP-1082] remove unused import

Author: steph-torres-nhs

lambdas/handlers/post_document_review_handler.py

@@ -10,7 +10,7 @@
 from utils.decorators.ensure_env_var import ensure_environment_variables
 from utils.decorators.handle_lambda_exceptions import handle_lambda_exceptions
 from utils.decorators.set_audit_arg import set_request_context_for_logging
-from utils.exceptions import InvalidNhsNumberException, DocumentReviewException, InvalidFileTypeException
+from utils.exceptions import InvalidNhsNumberException, InvalidFileTypeException
 from utils.lambda_exceptions import DocumentReviewLambdaException
 from utils.lambda_response import ApiGatewayResponse