added default error message for errors with status code 401

Author: andlinger

client/src/main/java/io/apistax/client/APIstaxClientImpl.java

@@ -191,6 +191,10 @@ private <T> T request(String path, BodyProvider body, String accept, Map<String,
                     var errorMessage = objectMapper.readValue(response.body(), ErrorMessage.class);
                     throw new APIstaxException(errorMessage.getMessages());
                 } catch (IOException e) {
+                    if(response.statusCode() == 401) {
+                        throw new APIstaxException(List.of("message.forbidden"), e);
+                    }
+
                     throw new APIstaxException(List.of("message.unknownError"), e);
                 }
             }