fix: make benchmark result in log more readable

benchmark return multi-line result, therefore should log the result from
new line to make the log more readable

scripts/lib/mlkem_test.py

@@ -171,7 +171,7 @@ def run_scheme(
             else:
                 log.info(f"passed")
         else:
-            log.info(f"{p.stdout.decode()}")
+            log.info(f"\n{p.stdout.decode()}")
             result = p.stdout.decode()
 
         if p.returncode != 0: