Update to latest discord.py (2.3.x)

[freiheit]

We're currently running with discord.py v1.7.3 (discord.py>=1.7<=2.0). v2.0 added a number of key features that would be handy.

In particular, I think with that update it should be possible for feedbot to post to threads, or to post to a ForumChannel...

Overall changes: https://discordpy.readthedocs.io/en/stable/migrating.html

Key changes for feedbot, from a quick scan of those:

• async Event Loop Changes (probably need to redo main() entirely, and likely move some of it into on_ready(). https://discordpy.readthedocs.io/en/stable/migrating.html#asyncio-event-loop-changes
• Intents are now required (should be minor change of adding a line). https://discordpy.readthedocs.io/en/stable/migrating.html#intents-are-now-required
• Threads support -- probably nothing needed (Client.get_channel() may now return a Thread, and Thread has the stuff we need)
• Probably other minor changes, like how function calls are handled
• Might need to update to newer python, and might have changes around asyncio stuff required for that.

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