Bump tornado from 6.5.1 to 6.5.5 (#300)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.5.1 to 6.5.5.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.5.1...v6.5.5)

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

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

Author: dependabot[bot]

requirements.txt

@@ -89,7 +89,7 @@ super_collections==0.5.3
 git+https://github.com/nhsengland/datascience.git@a7efc862d5cec28d3616fd13692398d3a232f9de#egg=suppress_logs&subdirectory=plugins/suppress_logs
 termcolor==3.1.0
 tinycss2==1.4.0
-tornado==6.5.1
+tornado==6.5.5
 traitlets==5.14.3
 typing_extensions==4.14.0
 urllib3==2.6.3