fix rand_core dep, update Scalar from_bytes

Author: Mr-Leshiy

rust/catalyst-voting/Cargo.toml

@@ -12,7 +12,7 @@ workspace = true
 
 [dependencies]
 anyhow = "1.0.89"
-rand_core = "0.6.4"
+rand_core = { version = "0.6.4", features = ["getrandom"] }
 rand_chacha = "0.3.1"
 curve25519-dalek = { version = "4.1.3", features = ["digest", "rand_core"] }
 ed25519-dalek = { version = "2.1.1", features = ["rand_core"] }

rust/catalyst-voting/src/crypto/group/ristretto255/decoding.rs

@@ -14,9 +14,8 @@ impl Scalar {
     /// # Errors
     ///   - Cannot decode scalar.
     pub fn from_bytes(bytes: [u8; Self::BYTES_SIZE]) -> anyhow::Result<Scalar> {
-        IScalar::from_canonical_bytes(bytes)
+        Into::<Option<_>>::into(IScalar::from_canonical_bytes(bytes))
             .map(Scalar)
-            .into_option()
             .ok_or(anyhow!("Cannot decode scalar."))
     }