Bump tornado from 6.4.1 to 6.4.2

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]>

requirements.txt

@@ -98,7 +98,7 @@ soupsieve==2.3.2.post1
 stack-data==0.6.1
 tenacity==8.2.3
 tomli==2.0.1
-tornado==6.4.1
+tornado==6.4.2
 traitlets==5.9.0
 typing_extensions==4.4.0
 urllib3==2.2.2