Unstructured upgrade (neo4j-labs#940)

* package upgrade

* Update requirements.txt

Author: aashipandya

backend/requirements.txt

@@ -39,7 +39,7 @@ starlette==0.41.3
 sse-starlette==2.1.3
 starlette-session==0.4.3
 tqdm==4.67.1
-unstructured[all-docs]==0.16.6
+unstructured[all-docs]
 unstructured==0.16.11
 unstructured-client==0.28.1
 unstructured-inference==0.8.1
@@ -58,4 +58,4 @@ graphdatascience==1.12
 Secweb==1.11.0
 ragas==0.2.6
 rouge_score==0.1.2
-langchain-neo4j==0.1.1
+langchain-neo4j==0.1.1