chore(deps): bump tornado from 6.3.3 to 6.4.2 in /backend/src/apiserv…

…er/visualization (#11402)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.3.3 to 6.4.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/v6.4.2/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.3.3...v6.4.2)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/src/apiserver/visualization/requirements.txt

@@ -509,7 +509,7 @@ tfx-bsl==1.9.0
     #   tensorflow-model-analysis
 threadpoolctl==3.2.0
     # via scikit-learn
-tornado==6.3.3
+tornado==6.4.2
     # via
     #   -r requirements.in
     #   bokeh