Bump tornado in /circleci/images/pgupgradetester/files/etc

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.5.2 to 6.5.5.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.5.2...v6.5.5)

---
updated-dependencies:
- dependency-name: tornado
  dependency-version: 6.5.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

circleci/images/pgupgradetester/files/etc/requirements.txt

@@ -56,7 +56,7 @@ ruamel.yaml==0.18.16; python_version >= '3.8'
 ruamel.yaml.clib==0.2.15; python_version >= '3.9'
 service-identity==24.2.0; python_version >= '3.8'
 sortedcontainers==2.4.0
-tornado==6.5.2; python_version >= '3.9'
+tornado==6.5.5; python_version >= '3.9'
 typing-extensions==4.14.0; python_version >= '3.9'
 urwid==3.0.3; python_full_version >= '3.9.0'
 wcwidth==0.6.0; python_version >= '3.8'