Update requirements.txt

Workshop/requirements.txt

@@ -32,7 +32,7 @@ semantic-kernel==0.4.1.dev0
 sec-edgar-downloader==5.0.2
 tabulate==0.9.0
 tenacity==8.2.2
-tiktoken==0.3.3
+tiktoken==0.4.0
 urllib3==2.0.4
 unstructured==0.8.1
 yfinance==0.2.30