added ruff test

shared/tests/test_scene3d_contracts.py

@@ -15,7 +15,6 @@ from pathlib import Path
 
 import numpy as np
 import pytest
-
 from orisys_app_shared.scene3d import contracts as c
 
 
@@ -477,7 +476,6 @@ def test_the_contract_layer_imports_without_qt_or_opengl():
     could be pulled in — the earlier spelling named PyQt5, before the migration.
     """
     import subprocess
-    import sys
 
     script = (
         "import sys;"