(complete) lemmy.radio upgrading to 0.18.3

This version brings major optimizations to the database queries, which significantly reduces CPU usage. There is also a change to the way federation activities are stored, which reduces database size by around 80%. Special thanks to @phiresky for their work on DB optimizations.

Wow they weren't kidding. DB size shrank by quite a bit. Curious to see what this does with our CPU usage. Also want to see if our federated instances dropped. QUITE a few instances have either de-federated or have stopped functioning lately.

As always, please let me know if you notice any issues, bad OR good!

~ 73 Ben