Change some Gun connection pool logs to debug level

lib/pleroma/telemetry/logger.ex

@@ -59,7 +59,7 @@ def handle_event(
         _,
         _
       ) do
-    Logger.error(fn ->
+    Logger.debug(fn ->
       "Connection pool had to refuse opening a connection to #{key} due to connection limit exhaustion"
     end)
   end
@@ -81,7 +81,7 @@ def handle_event(
         %{key: key, protocol: :http},
         _
       ) do
-    Logger.info(fn ->
+    Logger.debug(fn ->
       "Pool worker for #{key}: #{length(clients)} clients are using an HTTP1 connection at the same time, head-of-line blocking might occur."
     end)
   end