fix unstructured requirements (#1821)

Co-authored-by: jyong <jyong@dify.ai>

api/requirements.txt

@@ -55,6 +55,6 @@ pymilvus==2.3.0
 qdrant-client==1.6.4
 cohere~=4.32
 unstructured~=0.10.27
-unstructured[docx,pptx]~=0.10.27
+unstructured[docx,pptx,msg,md,ppt]~=0.10.27
 bs4~=0.0.1
 markdown~=3.5.1