Fix import in Django connector

[ewjoachim]

Relates to #934

Successful PR Checklist:

• [ ] Tests
  • [x] (not applicable?)
• [ ] Documentation
  • [x] (not applicable?)

PR label(s):

• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20breaking%20%F0%9F%92%A5
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20feature%20%E2%AD%90%EF%B8%8F
• [x] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20bugfix%20%F0%9F%95%B5%EF%B8%8F
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20miscellaneous%20%F0%9F%91%BE
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20dependencies%20%F0%9F%A4%96
• [ ] https://github.com/procrastinate-org/procrastinate/labels/PR%20type%3A%20documentation%20%F0%9F%93%9A

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Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
procrastinate
blueprints.py
cli.py
manager.py
psycopg_connector.py
shell.py
sync_psycopg_connector.py
tasks.py
testing.py
utils.py
worker.py
procrastinate/contrib/aiopg
aiopg_connector.py
procrastinate/contrib/django
django_connector.py
migrations_magic.py
models.py
procrastinate/contrib/django/management/commands
procrastinate.py
procrastinate/contrib/psycopg2
psycopg2_connector.py
procrastinate/contrib/sqlalchemy
psycopg2_connector.py
Project Total

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