Reformat imports to a consistent style for imports

rustfmt.toml configuration:
  imports_granularity = "One"
  group_imports = "One"

sdk/src/packet.rs

@@ -1,9 +1,11 @@
-use crate::clock::Slot;
-use bincode::Result;
-use serde::Serialize;
-use std::{
-    net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
-    {fmt, io},
+use {
+    crate::clock::Slot,
+    bincode::Result,
+    serde::Serialize,
+    std::{
+        fmt, io,
+        net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
+    },
 };
 
 /// Maximum over-the-wire size of a Transaction