Updates the requirements on tornado to permit the latest version.

Changelog

Release notes

.. toctree:: :maxdepth: 2

releases/v6.4.0 releases/v6.3.3 releases/v6.3.2 releases/v6.3.1 releases/v6.3.0 releases/v6.2.0 releases/v6.1.0 releases/v6.0.4 releases/v6.0.3 releases/v6.0.2 releases/v6.0.1 releases/v6.0.0 releases/v5.1.1 releases/v5.1.0 releases/v5.0.2 releases/v5.0.1 releases/v5.0.0 releases/v4.5.3 releases/v4.5.2 releases/v4.5.1 releases/v4.5.0 releases/v4.4.3 releases/v4.4.2 releases/v4.4.1 releases/v4.4.0 releases/v4.3.0 releases/v4.2.1 releases/v4.2.0 releases/v4.1.0 releases/v4.0.2 releases/v4.0.1 releases/v4.0.0 releases/v3.2.2 releases/v3.2.1 releases/v3.2.0 releases/v3.1.1 releases/v3.1.0 releases/v3.0.2 releases/v3.0.1 releases/v3.0.0 releases/v2.4.1 releases/v2.4.0 releases/v2.3.0 releases/v2.2.1

... (truncated)

Commits

b3f2a4b Merge pull request #3352 from bdarnell/master
451419c Set version to 6.4 final
5a87723 Merge pull request #3348 from bdarnell/iostream-hostname-test
2da0a99 iostream_test: Don't require server-side log on windows
06e1a65 iostream_test: Test check_hostname functionality.
a6dfd70 Merge pull request #3341 from bdarnell/more-utcnow
c60d80c web,demos: Remove more uses of deprecated datetime utc methods
55db80e Merge pull request #3339 from tornadoweb/dependabot/pip/urllib3-1.26.18
ec59fa0 Merge pull request #3332 from bdarnell/selector-thread-atexit
dcc6e59 build(deps): bump urllib3 from 1.26.17 to 1.26.18
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