config.exs: set gun retries to 0

The new pooling code just removes the connection when it's down,
there is no need to reconnect a connection that is just sitting idle,
better just open a new one next time it's needed

config/config.exs

@@ -652,8 +652,7 @@
   connection_acquisition_retries: 5,
   max_connections: 250,
   max_idle_time: 30_000,
-  retry: 1,
-  retry_timeout: 1000,
+  retry: 0,
   await_up_timeout: 5_000
 
 config :pleroma, :pools,