Update requirements.txt

Author: karanchellani

backend/requirements.txt

@@ -51,7 +51,7 @@ wrapt==1.17.2
 yarl==1.18.3
 youtube-transcript-api==1.0.0
 zipp==3.21.0
-sentence-transformers==3.4.1
+sentence-transformers==4.0.2
 google-cloud-logging==3.11.4
 pypandoc==1.15
 graphdatascience==1.14
@@ -60,4 +60,4 @@ ragas==0.2.14
 rouge_score==0.1.2
 langchain-neo4j==0.4.0
 pypandoc-binary==1.15
-chardet==5.2.0
+chardet==5.2.0