Bump tornado from 4.3 to 6.3.2 in /frameworks/Python/weppy

Bumps [tornado](https://github.com/tornadoweb/tornado) from 4.3 to 6.3.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](https://github.com/tornadoweb/tornado/compare/v4.3.0...v6.3.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

frameworks/Python/weppy/requirements-pypy.txt

@@ -1,4 +1,4 @@
 pg8000==1.10.6
 weppy==1.3
 gunicorn==19.9.0
-tornado==4.3
+tornado==6.3.2