bump tornado dependency to version 6.5.7 for security updates

Author: Scott5S

pyproject.toml

@@ -27,7 +27,7 @@ dependencies = [
     "jupyter_core>=5.1,!=6.0.*",
     # For tk event loop support only.
     "nest_asyncio2>=1.7.0",
-    "tornado>=6.4.1",
+    "tornado>=6.5.7",
     "matplotlib-inline>=0.1",
     'appnope>=0.1.2;platform_system=="Darwin"',
     "pyzmq>=25",