fix broken tests (for github actions)

Author: Zhe Yu

tests/subcommands/query/test_reranker.py

@@ -262,13 +262,11 @@ def test_get_reranker():
     ), "configs.reranker_params should fallback to default params."
 
 
-def test_supported_rerankers_initialization():
+def test_supported_rerankers_initialization(config, naive_reranker_conf):
     """Test that __supported_rerankers contains the expected default rerankers"""
 
-    assert isinstance(
-        get_reranker(Config(reranker="CrossEncoderReranker")), CrossEncoderReranker
-    )
-    assert isinstance(get_reranker(Config(reranker="NaiveReranker")), NaiveReranker)
+    assert isinstance(get_reranker(config), CrossEncoderReranker)
+    assert isinstance(get_reranker(naive_reranker_conf), NaiveReranker)
     assert len(get_available_rerankers()) == 2