Bump tornado from 6.1.0 to 6.5.1 in /lib/sub_repos/urllib3 (#869)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.1.0 to 6.5.1.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.1.0...v6.5.1)

---
updated-dependencies:
- dependency-name: tornado
  dependency-version: 6.5.1
  dependency-type: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: hwikle-lanl <154543628+hwikle-lanl@users.noreply.github.com>

Author: dependabot[bot]

lib/sub_repos/urllib3/dev-requirements.txt

@@ -1,7 +1,7 @@
 mock==3.0.5
 coverage~=5.0
 tornado==5.1.1;python_version<="2.7"
-tornado==6.1.0;python_version>="3.5"
+tornado==6.5.1;python_version>="3.5"
 PySocks==1.7.1
 # https://github.com/Anorov/PySocks/issues/131
 win-inet-pton==1.1.0