std.Io.Timestamp: when creating a Clock.Timestamp actually set .raw instead of the non-existant .nanoseconds

lib/std/Io.zig

@@ -895,7 +895,7 @@ pub const Timestamp = struct {
     }
 
     pub fn withClock(t: Timestamp, clock: Clock) Clock.Timestamp {
-        return .{ .nanoseconds = t.nanoseconds, .clock = clock };
+        return .{ .raw = t, .clock = clock };
     }
 
     pub fn fromNanoseconds(x: i96) Timestamp {