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>

Cargo.toml

@@ -18,6 +18,7 @@ async-trait = { optional = true, version = "0.1" }
 audiopus = { optional = true, version = "0.3.0-rc.0" }
 byteorder = { optional = true, version = "1" }
 bytes = { optional = true, version = "1" }
+crypto_secretbox = { optional = true, features = ["std"], version = "0.1" }
 dashmap = { optional = true, version = "5" }
 derivative = "2"
 discortp = { default-features = false, features = ["discord", "pnet", "rtp"], optional = true, version = "0.5" }
@@ -50,7 +51,6 @@ twilight-model = { default-features = false, optional = true, version = "0.15.0"
 typemap_rev = { optional = true, version = "0.3" }
 url = { optional = true, version = "2" }
 uuid = { features = ["v4"], optional = true, version = "1" }
-xsalsa20poly1305 = { features = ["std"], optional = true, version = "0.9" }
 
 [dependencies.serenity]
 version = "0.11"
@@ -91,6 +91,7 @@ driver = [
     "dep:async-trait",
     "dep:audiopus",
     "dep:byteorder",
+    "dep:crypto_secretbox",
     "dep:discortp",
     "dep:reqwest",
     "dep:flume",
@@ -113,7 +114,6 @@ driver = [
     "dep:typemap_rev",
     "dep:url",
     "dep:uuid",
-    "dep:xsalsa20poly1305",
     "tokio?/fs",
     "tokio?/io-util",
     "tokio?/macros",