Migration of column "glpi_plugin_manageentities_configs.documentcategories_id" cannot be done as it contains negative values.

```
[root@glpi glpi]# php bin/console glpi:migration:unsigned_keys
Found 1 primary/foreign key columns(s) using signed integers.
Möchten Sie fortfahren? [Yes/no]y
Migration of column "glpi_plugin_manageentities_configs.documentcategories_id" cannot be done as it contains negative values.
 1/1 [============================] 100%
Errors occured during migration.
```