Update the way sources are passed to serper

agents/google_serper_search_agent.py

@@ -3,8 +3,10 @@ from langchain_community.utilities import GoogleSerperAPIWrapper
 
 
 class GoogleSerperSearchAgent:
-    def __init__(self, sources: list[str]) -> None:
-        self._sources = sources
+    def __init__(self, sources_path: str) -> None:
+        with open(sources_path) as f:
+            self._sources = [line.strip() for line in f.readlines()]
+
         self._api = GoogleSerperAPIWrapper()
 
     def run(self, query: str, limit_per_source: int = 3) -> pd.DataFrame: