Fixed graphql_relay deprecation warning

[AngelOnFira]

While using Graphene Django, I came across this during tests:

../../home/vscode/.local/lib/python3.10/site-packages/graphene_django/fields.py:4
  /home/vscode/.local/lib/python3.10/site-packages/graphene_django/fields.py:4: DeprecationWarning: The 'arrayconnection' module is deprecated. Functions should be imported from the top-level package instead.
    from graphql_relay.connection.arrayconnection import (

This PR should fix that.