Increase slog buffer size (#5882)

* Increase slog buffer size

lighthouse/environment/src/lib.rs

@@ -36,7 +36,7 @@ use {futures::channel::oneshot, std::cell::RefCell};
 
 pub use task_executor::test_utils::null_logger;
 
-const LOG_CHANNEL_SIZE: usize = 2048;
+const LOG_CHANNEL_SIZE: usize = 16384;
 const SSE_LOG_CHANNEL_SIZE: usize = 2048;
 /// The maximum time in seconds the client will wait for all internal tasks to shutdown.
 const MAXIMUM_SHUTDOWN_TIME: u64 = 15;