langchain: update use of predict_and_parse in LLMChainFilter (#21389)

Following https://github.com/langchain-ai/langchain/pull/20130

Removes deprecation warnings in docs here:
https://python.langchain.com/docs/modules/data_connection/retrievers/contextual_compression/

Tested using the same docs notebook + existing integration test.

libs/langchain/langchain/retrievers/document_compressors/chain_filter.py

@@ -47,9 +47,10 @@ class LLMChainFilter(BaseDocumentCompressor):
         filtered_docs = []
         for doc in documents:
             _input = self.get_input(query, doc)
-            include_doc = self.llm_chain.predict_and_parse(
+            output_dict = self.llm_chain.invoke(_input, config={"callbacks": callbacks})
-                **_input, callbacks=callbacks
+            output = output_dict[self.llm_chain.output_key]
-            )
+            if self.llm_chain.prompt.output_parser is not None:
+                include_doc = self.llm_chain.prompt.output_parser.parse(output)
             if include_doc:
                 filtered_docs.append(doc)
         return filtered_docs