Bump tornado from 6.4 to 6.4.1 in /examples

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.4 to 6.4.1.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.4.0...v6.4.1)

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

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

examples/requirements.txt

@@ -1,6 +1,6 @@
 fastapi==0.111.0
 uvicorn==0.29.0
-tornado==6.4
+tornado==6.4.1
 aiohttp==3.9.5
 gunicorn==22.0.0