chore(deps): migrate direct encoding deps to simd (#6690)

crates/rio-v2/Cargo.toml

@@ -57,7 +57,7 @@ hotpath.workspace = true
 aes-gcm = { workspace = true, features = ["rand_core"] }
 bytes = { workspace = true, features = ["serde"] }
 chacha20poly1305.workspace = true
-hex.workspace = true
+hex-simd.workspace = true
 hmac.workspace = true
 minlz.workspace = true
 pin-project-lite.workspace = true

crates/rio-v2/src/encrypt_reader.rs

@@ -731,12 +731,15 @@ fn random_stream_nonce() -> [u8; 12] {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use hex::encode as hex_encode;
     use std::io::Cursor;
     use tokio::io::AsyncReadExt;
 
     const DARE_PACKAGE_SIZE: usize = DARE_HEADER_SIZE + DARE_PAYLOAD_SIZE + DARE_TAG_SIZE;
 
+    fn hex_encode(data: impl AsRef<[u8]>) -> String {
+        hex_simd::encode_to_string(data, hex_simd::AsciiCase::Lower)
+    }
+
     #[tokio::test]
     async fn decrypt_reader_can_start_from_non_zero_sequence_number() {
         let plaintext = vec![0xAB; DARE_PAYLOAD_SIZE * 2 + 19];