[TODO] Fix compatibility with anyio 2.0.0+

[webknjaz]

Refs:

• 3cb7830
• https://anyio.readthedocs.io/en/stable/versionhistory.html
• agronholm/anyio@5e8b5c5
• [Question] Removal of create_queue, recommendation for producer/consumer workflows? agronholm/anyio#124
• A way to collect results upon exiting task group  agronholm/anyio#100 (comment)