Tests: Temporarily increase OpenImageDenoise test threshold for upgrade

So that both the current and upcoming version pass tests. To be lowered
again when all platforms have upgraded.

tests/python/cycles_render_tests.py

@@ -147,6 +147,8 @@ def main():
     test_dir_name = Path(test_dir).name
     if test_dir_name in ('motion_blur', 'integrator', ):
         report.set_fail_threshold(0.032)
+    if test_dir_name == "denoise":
+        report.set_fail_threshold(0.25)
 
     ok = report.run(test_dir, blender, get_arguments, batch=args.batch)