Update tornado requirement in the pip group

Updates the requirements on [tornado](https://github.com/tornadoweb/tornado) to permit the latest version.

Updates `tornado` to 6.4.1
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v4.3.0...v6.4.1)

---
updated-dependencies:
- dependency-name: tornado
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
     "pyOpenSSL>=17.1.0",
     "requests>=2.27.1",
     "sockjs_tornado>=1.0.7",
-    "tornado>=4.3,<5.0",
+    "tornado>=4.3,<7.0",
     "typing_extensions>=4.12.2",
 ]
 license = {file = "LICENSE"}