Change how to import lazy_fixture

tests/common/test_models.py:
It seems that without importing from pytest_lazyfixture, lazy_fixture
types are not properly detected:
TvoroG/pytest-lazy-fixture#51

tests/common/test_models.py

@@ -3,7 +3,8 @@
 from unittest.mock import patch
 
 from pydantic import ValidationError
-from pytest import lazy_fixture, mark, raises
+from pytest import mark, raises
+from pytest_lazyfixture import lazy_fixture
 
 from repod.common import models
 from tests.conftest import (