Driver: Replace xsalsa20poly1305 with crypto_secretbox (#198)

As of v0.9.1, `xsalsa20poly1305` has been deprecated. This is a mostly seamless replacement, as it appears to be the same crate authors / code / etc.

Co-authored-by: Kyle Simpson <kyleandrew.simpson@gmail.com>

src/driver/tasks/udp_rx/mod.rs

@@ -12,6 +12,7 @@ use crate::{
     Config,
 };
 use bytes::BytesMut;
+use crypto_secretbox::XSalsa20Poly1305 as Cipher;
 use discortp::{
     demux::{self, DemuxedMut},
     rtp::RtpPacket,
@@ -25,7 +26,6 @@ use std::{
 };
 use tokio::{net::UdpSocket, select, time::Instant};
 use tracing::{error, instrument, trace, warn};
-use xsalsa20poly1305::XSalsa20Poly1305 as Cipher;
 
 type RtpSequence = Wrapping<u16>;
 type RtpTimestamp = Wrapping<u32>;