Bump tornado from 6.3.3 to 6.4.1 in /examples/streamlit/quickstart

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.3.3 to 6.4.1.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.3.3...v6.4.1)

---
updated-dependencies:
- dependency-name: tornado
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/streamlit/quickstart/requirements.txt

@@ -83,7 +83,7 @@ terminado==0.12.1
 testpath==0.5.0
 toml==0.10.2
 toolz==0.11.1
-tornado==6.3.3
+tornado==6.4.1
 traitlets==5.1.1
 typing-extensions==3.10.0.2
 tzdata==2021.5