Merge branch 'deactivate-gun-again' into 'develop'

Config: Default to Hackney again

See merge request pleroma/pleroma!2821

config/config.exs

@@ -172,7 +172,7 @@ config :mime, :types, %{
   "application/ld+json" => ["activity+json"]
 }
 
-config :tesla, adapter: Tesla.Adapter.Gun
+config :tesla, adapter: Tesla.Adapter.Hackney
 
 # Configures http settings, upstream proxy etc.
 config :pleroma, :http,