Update app.py

app.py

@@ -136,7 +136,7 @@ def merge_txt_to_db(filename,db,progress,progress_step=0.1):
   progress(progress_step,'txt unpacked')
   return merge_split_docs_to_db(split_docs,db,progress,progress_step)
 
-def unpack_zip_file(filename,db,progress):
+def unpack_zip_file(filename:str,db:FAISS,progress):
     with ZipFile(filename, 'r') as zipObj:
         contents = zipObj.namelist()
         print(f"unpack zip: contents: {contents}")