Fix some clippy warnings

rust/src/contract_interface.rs

@@ -986,7 +986,7 @@ impl Display for ContractInstanceId {
 
 /// A complete key specification, that represents a cryptographic hash that identifies the contract.
 #[serde_as]
-#[derive(Debug, Eq, Clone, Serialize, Deserialize)]
+#[derive(Debug, Eq, Copy, Clone, Serialize, Deserialize)]
 #[cfg_attr(any(feature = "testing", test), derive(arbitrary::Arbitrary))]
 pub struct ContractKey {
     instance: ContractInstanceId,

rust/src/delegate_interface.rs

@@ -385,7 +385,7 @@ pub trait DelegateInterface {
     ///
     /// # Arguments
     /// - attested: an optional identifier for the client of this function. Usually will
-    /// be a [`ContractInstanceId`].
+    ///   be a [`ContractInstanceId`].
     fn process(
         parameters: Parameters<'static>,
         attested: Option<&'static [u8]>,

rust/src/versioning.rs

@@ -219,7 +219,7 @@ impl ContractContainer {
     /// Return the `ContractKey` from the specific contract version.
     pub fn key(&self) -> ContractKey {
         match self {
-            Self::Wasm(ContractWasmAPIVersion::V1(contract_v1)) => contract_v1.key().clone(),
+            Self::Wasm(ContractWasmAPIVersion::V1(contract_v1)) => *contract_v1.key(),
         }
     }