chore: double default session event buffer to 128 (#819)

Co-authored-by: Enrique Ortiz <evalir@users.noreply.github.com>

crates/net/network/src/session/config.rs

@@ -32,7 +32,7 @@ impl Default for SessionsConfig {
             // `buffer + num sessions`. Each session can therefore fit at least 1 message in the
             // channel. The buffer size is additional capacity. The channel is always drained on
             // `poll`.
-            session_event_buffer: 64,
+            session_event_buffer: 128,
             limits: Default::default(),
             request_timeout: REQUEST_TIMEOUT,
         }