Update tests/test_exporter.py

At the moment, it's not clear from its name that the focus of the test is a circular dependency on the root package.

Co-authored-by: Randy Döring <[email protected]>

Author: brechtm

tests/test_exporter.py

@@ -1130,7 +1130,7 @@ def test_exporter_can_export_requirements_txt_with_nested_packages_cyclic(
     assert content == expected
 
 
-def test_exporter_can_export_requirements_txt_with_circular_dependency(
+def test_exporter_can_export_requirements_txt_with_circular_root_dependency(
     tmp_path: Path, poetry: Poetry
 ) -> None:
     poetry.locker.mock_lock_data(  # type: ignore[attr-defined]