Migrate to aioredis 2.0

[mattyweb]

Description

We've been stuck on older versions of Python and Redis due to the spotty maintenance of the aioredis library--the last official release of which was Dec 2019. It only supports Python 3.7 and Redis 5. Neither is an emergency at this moment but to ensure the long-term viability of the project we'd want to upgrade aioredis to 2.0.X, Python to 3.8 or later, and Redis to 6.

Action Items

Upgrate aioredis to 2.0.X (when it's available and probably at least 2.0.1 or 2.0.2). Test. Decide whether to upgrade Redis and Python or do those as separate tickets.

Resources

See here: aio-libs-abandoned/aioredis-py#930

[mattyweb]

Just to clarify, aioredis 2 does not exist yet. I'm guessing will be another month or two before 2.0.1 is available.

[EchoProject]

Check-in with Engineer and Data team to see if new versions of Python and Redis are relevant to current development.