fix URL for ingest

Author: vbarda

backend/ingest.py

@@ -43,7 +43,7 @@ def metadata_extractor(
 
 def load_langchain_docs():
     return SitemapLoader(
-        "https://python.langchain.com/v0.2/sitemap.xml",
+        "https://python.langchain.com/sitemap.xml",
         filter_urls=["https://python.langchain.com/"],
         parsing_function=langchain_docs_extractor,
         default_parser="lxml",