error when exporting / importing rack list

When trying to export/import racks across ralph instances, a server error is thrown

### Steps to reproduce

Create several racks in an instance of ralph. Export the list. Try to import it in another instance.

ERROR [MainProcess 936] base - Internal Server Error: /data_center/rack/process_import/
Traceback (most recent call last):
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/core/handlers/base.py", line 132, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/python3.6/contextlib.py", line 52, in inner
return func(*args, **kwds)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/utils/decorators.py", line 110, in _wrapped_view
response = view_func(request, *args, **kwargs)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/views/decorators/cache.py", line 57, in _wrapped_view_func
response = view_func(request, *args, **kwargs)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/contrib/admin/sites.py", line 233, in inner
return view(request, *args, **kwargs)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/admin.py", line 159, in process_import
user=request.user)
File "/usr/lib/python3.6/contextlib.py", line 52, in inner
return func(*args, **kwds)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py", line 395, in import_data
six.reraise(*sys.exc_info())
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/utils/six.py", line 686, in reraise
raise value
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py", line 379, in import_data
self.save_m2m(instance, row, real_dry_run)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py", line 251, in save_m2m
self.import_field(field, obj, data)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/resources.py", line 230, in import_field
field.save(obj, data)
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/import_export/fields.py", line 108, in save
setattr(obj, attrs[-1], self.clean(data))
File "/opt/ralph/ralph-core/lib/python3.6/site-packages/django/db/models/fields/related.py", line 1261, in __set__
"intermediary model. Use %s.%s's Manager instead." % (opts.app_label, opts.object_name)
AttributeError: Cannot set values on a ManyToManyField which specifies an intermediary model. Use data_center.RackAccessory's Manager instead.

### Expected behavior

List should import.

### Actual behavior

Server error listed above.

### Environment

* Ralph version: 20230103.1
* Operating system: ubuntu 18
* Method of installation: Deb package? Manual installation? Docker? deb package