ML-DSA-44: pass seed by value in pkcs8 serialization

Remove the unnecessary & reference when constructing
MlDsa44PrivateKeyValue::Seed.

Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>

Author: abbra

src/rust/cryptography-key-parsing/src/pkcs8.rs

@@ -515,7 +515,7 @@ pub fn serialize_private_key(
                     // RFC 9881 Section 6: Use seed-only format (recommended for storage efficiency)
                     // Encode as [0] IMPLICIT OCTET STRING (SIZE (32))
                     let seed = ml_dsa_params.private_key_seed()?;
-                    let key_value = MlDsa44PrivateKeyValue::Seed(&seed);
+                    let key_value = MlDsa44PrivateKeyValue::Seed(seed);
                     let private_key_der = asn1::write_single(&key_value)?;
                     (AlgorithmParameters::Mldsa44, private_key_der)
                 } else {