Update requirements.txt

requirements.txt

@@ -1,6 +1,7 @@
 docx2txt==0.8
 langchain==0.2.1
-langchain_community==0.2.1
-langchain_huggingface==0.0.3
+langchain-community==0.2.1
+langchain-huggingface==0.0.3
 sentencepiece==0.2.0
-PyPDF2
+PyPDF2
+protobuf