test: Fix test_measure_time_cpu_sync flakiness (#1656)

Closes: #1634

Author: vdusek

tests/unit/_utils/test_measure_time.py

@@ -26,7 +26,11 @@ def test_measure_time_cpu_sync() -> None:
 
     assert elapsed.cpu is not None
     assert elapsed.wall is not None
-    assert elapsed.cpu >= 0.05
+
+    # Just verify that CPU time is measured and reasonable (> 0 and <= wall time).
+    # The exact CPU time can vary significantly based on system load and scheduling.
+    assert elapsed.cpu > 0
+    assert elapsed.cpu <= elapsed.wall
 
 
 async def test_measure_time_wall_async() -> None: