Bump tornado from 6.3.3 to 6.4.1 in /envs

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]>

envs/requirements.txt

@@ -103,7 +103,7 @@ structlog==23.2.0
 terminado==0.17.1
 tinycss2==1.2.1
 tomli==2.0.1
-tornado==6.3.3
+tornado==6.4.1
 traitlets==5.13.0
 types-python-dateutil==2.8.19.14
 typing_extensions==4.8.0