bump tornado version

blink1073 · blink1073 · commit 30b9ccd5f6c8 · 2022-03-03T09:55:15.000-06:00
diff --git a/requirements.txt b/requirements.txt
@@ -3,5 +3,5 @@ jupyter_core>=4.9.2
 nest-asyncio>=1.5
 python-dateutil>=2.1
 pyzmq>=17
-tornado>=5.0
+tornado>=6.0
 traitlets
