build(deps): update rust-toolchain to 1.67 and bump uuid to 1.4

some of the dependency updates are requiring a higher version of the
rust toolchain. bump to 1.67 and fix new clippy lints.

also fix dprint to 0.39.1 because 0.40 has breaking changes.

monero-rpc/src/monerod.rs

@@ -195,7 +195,7 @@ mod monero_serde_hex_block {
     {
         let hex = String::deserialize(deserializer)?;
 
-        let bytes = hex::decode(&hex).map_err(D::Error::custom)?;
+        let bytes = hex::decode(hex).map_err(D::Error::custom)?;
         let mut cursor = Cursor::new(bytes);
 
         let block = monero::Block::consensus_decode(&mut cursor).map_err(D::Error::custom)?;