Update aiofiles requirement from <0.6,>=0.4 to >=0.4,<0.7 (#1059)

Updates the requirements on [aiofiles](https://github.com/Tinche/aiofiles) to permit the latest version.
- [Release notes](https://github.com/Tinche/aiofiles/releases)
- [Commits](Tinche/aiofiles@v0.4.0...v0.6.0)

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

setup.py

@@ -54,7 +54,7 @@ def get_version():
         "pint~=0.9",
         "pluggy~=0.13.0",
         "uvicorn~=0.11",
-        "aiofiles>=0.4,<0.6",
+        "aiofiles>=0.4,<0.7",
         "janus>=0.4,<0.7",
         "asgi-csrf>=0.6",
         "PyYAML~=5.3",