Bump tornado from 6.0.4 to 6.1 (#1353)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.0.4 to 6.1.
- [Release notes](https://github.com/tornadoweb/tornado/releases)
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](https://github.com/tornadoweb/tornado/compare/v6.0.4...v6.1.0)

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

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

requirements.txt

@@ -3,7 +3,7 @@ PyYAML==5.3.1
 paho-mqtt==1.5.1
 colorama==0.4.4
 colorlog==4.6.2
-tornado==6.0.4
+tornado==6.1
 protobuf==3.13.0
 tzlocal==2.1
 pytz==2020.4