Merge pull request #9419 from TechEmpower/dependabot/pip/frameworks/Python/bottle/tornado-6.4.2

Bump tornado from 4.5.3 to 6.4.2 in /frameworks/Python/bottle

Author: github-actions[bot]

frameworks/Python/bottle/requirements-pypy.txt

@@ -3,4 +3,4 @@ bottle-sqlalchemy==0.4.3
 gunicorn==19.9.0
 PyMySQL==0.8.0
 SQLAlchemy==1.3.0
-tornado==4.5.3
+tornado==6.4.2