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/mixer/mod.rs

@@ -15,6 +15,7 @@ use super::{
     error::{Error, Result},
     message::*,
 };
+use crate::driver::crypto::TAG_SIZE;
 use crate::{
     constants::*,
     driver::MixMode,
@@ -53,7 +54,6 @@ use symphonia_core::{
 };
 use tokio::runtime::Handle;
 use tracing::error;
-use xsalsa20poly1305::TAG_SIZE;
 
 #[cfg(test)]
 use crate::driver::test_config::{OutputMessage, OutputMode};