Bump tornado from 6.3.3 to 6.4

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.3.3 to 6.4.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.3.3...v6.4.0)

---
updated-dependencies:
- dependency-name: tornado
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -19,7 +19,7 @@ mccabe==0.7.0
 certifi==2023.11.17
 
 pyparsing==3.1.1
-tornado==6.3.3
+tornado==6.4
 cssselect==1.2.0
 lxml==4.9.3
 fuzzywuzzy==0.18.0