fix: have correct type check

Author: tngraf

sw360/attachments.py

@@ -202,7 +202,7 @@ def _upload_resource_attachment(self, resource_type: str, resource_id: str, uplo
         if resource_type not in ("releases", "components", "projects"):
             raise SW360Error(message="Invalid resource type provided!")
 
-        if (type(resource_id) is not str) or (resource_id == ""):
+        if (not isinstance(resource_id, str)) or (resource_id == ""):
             raise SW360Error(message="Invalid resource id provided!")
 
         filename = os.path.basename(upload_file)