Bump tornado from 6.1 to 6.3.2

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.1 to 6.3.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.1.0...v6.3.2)

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

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

requirements.txt

@@ -89,7 +89,7 @@ soupsieve==2.2.1
 terminado==0.10.0
 testpath==0.5.0
 toml==0.10.2
-tornado==6.1
+tornado==6.3.2
 tqdm==4.60.0
 traitlets==5.0.5
 typing-extensions==3.10.0.0