Bump tornado from 6.4.1 to 6.5.7 in /ModelTraining

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.4.1 to 6.5.7.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.4.1...v6.5.7)

---
updated-dependencies:
- dependency-name: tornado
  dependency-version: 6.5.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ModelTraining/requirements.lock.txt

@@ -116,7 +116,7 @@ tinycss2==1.4.0
 torch==1.6.0+cu92
 torchaudio==0.6.0
 torchvision==0.7.0+cu92
-tornado==6.4.1
+tornado==6.5.7
 tqdm==4.67.0
 traitlets==5.14.3
 typer==0.13.0