fix test to use UTC time

Signed-off-by: Jonathan Bnayahu <bnayahu@il.ibm.com>

Author: bnayahu

tests/library/test_cli.py

@@ -750,7 +750,7 @@ def test_save_results_to_disk_summary_only(
         """Test saving only the summary results file (log_samples=False)."""
         # --- Arrange ---
         # (Arrange section remains the same as previous version)
-        mock_timestamp = "2025-04-14T10:00:00"
+        mock_timestamp = "2025-04-14T08:00:00"
         mock_now = MagicMock()
         mock_now.strftime.return_value = mock_timestamp
         mock_datetime.now.return_value = mock_now