Cleanup: use static sets for contains checks, remove f-string use

tests/python/cycles_render_tests.py

@@ -144,7 +144,7 @@ def main():
     # underwater_caustics.blend gives quite different results on Linux and Intel macOS compared to
     # Windows and Arm macOS.
     test_dir_name = Path(test_dir).name
-    if test_dir_name in ('motion_blur', 'integrator', ):
+    if test_dir_name in {'motion_blur', 'integrator'}:
         report.set_fail_threshold(0.032)
 
     ok = report.run(test_dir, blender, get_arguments, batch=args.batch)