1) replace gpt4.1 to gpt5.4, 2) accelerate loading speed

tests/test_config.toml

@@ -0,0 +1,3 @@
+[test]
+key1 = "value1"
+key2 = "value2"

tests/test_config.yaml

@@ -1,3 +0,0 @@
-test:
-  key1: value1
-  key2: value2

tests/test_utils.py

@@ -8,7 +8,7 @@ from translator.utils import parse_config
 
 class TestUtils:
     def test_parse_config(self) -> None:
-        config = parse_config('tests/test_config.yaml')
+        config = parse_config('tests/test_config.toml')
         assert isinstance(config, dict)
         assert 'test' in config
         assert 'key1' in config['test']