fix: redundant warning messages

Signed-off-by: Hao Lin <linhaomails@gmail.com>

Author: andylin-hao

libero/libero/__init__.py

@@ -1,4 +1,5 @@
 import os
+import warnings
 import yaml
 from filelock import FileLock
 
@@ -44,7 +45,7 @@ def get_libero_path(query_key):
     # Give warnings in case the user needs to access the paths
     for key in config:
         if not os.path.exists(config[key]):
-            print(f"[Warning]: {key} path {config[key]} does not exist!")
+            warnings.warn(f"{key} path {config[key]} does not exist!")
 
     assert (
         query_key in config