Bump tornado from 6.4.1 to 6.4.2 in /web

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.4.1 to 6.4.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/v6.4.2/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.4.1...v6.4.2)

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

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

web/requirements.txt

@@ -70,7 +70,7 @@ six==1.16.0
 SQLAlchemy==2.0.27
 stack-data==0.6.3
 tenacity==8.2.3
-tornado==6.4.1
+tornado==6.4.2
 traitlets==5.14.1
 typing_extensions==4.9.0
 tzdata==2024.1