Update janus requirement from <0.6,>=0.4 to >=0.4,<0.7 (#1017)

Updates the requirements on [janus](https://github.com/aio-libs/janus) to permit the latest version.
- [Release notes](https://github.com/aio-libs/janus/releases)
- [Changelog](https://github.com/aio-libs/janus/blob/master/CHANGES.rst)
- [Commits](https://github.com/aio-libs/janus/compare/v0.4.0...v0.6.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

setup.py

@@ -54,7 +54,7 @@ setup(
         "pluggy~=0.13.0",
         "uvicorn~=0.11",
         "aiofiles>=0.4,<0.6",
-        "janus>=0.4,<0.6",
+        "janus>=0.4,<0.7",
         "asgi-csrf>=0.6",
         "PyYAML~=5.3",
         "mergedeep>=1.1.1,<1.4.0",