rust: upgrade model with new checkmessage requirements

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

cln-grpc/proto/node.proto

@@ -388,7 +388,7 @@ message CheckmessageRequest {
 
 message CheckmessageResponse {
 	bool verified = 1;
-	optional bytes pubkey = 2;
+	bytes pubkey = 2;
 }
 
 message CloseRequest {

cln-grpc/src/convert.rs

@@ -299,7 +299,7 @@ impl From<&responses::CheckmessageResponse> for pb::CheckmessageResponse {
     fn from(c: &responses::CheckmessageResponse) -> Self {
         Self {
             verified: c.verified.clone(), // Rule #2 for type boolean
-            pubkey: c.pubkey.as_ref().map(|v| v.to_vec()), // Rule #2 for type pubkey?
+            pubkey: c.pubkey.to_vec(), // Rule #2 for type pubkey
         }
     }
 }

cln-rpc/src/model.rs

@@ -1441,8 +1441,8 @@ pub mod responses {
 	pub struct CheckmessageResponse {
 	    #[serde(alias = "verified")]
 	    pub verified: bool,
-	    #[serde(alias = "pubkey", skip_serializing_if = "Option::is_none")]
-	    pub pubkey: Option<Pubkey>,
+	    #[serde(alias = "pubkey")]
+	    pub pubkey: Pubkey,
 	}
 
 	/// Whether we successfully negotiated a mutual close, closed without them, or discarded not-yet-opened channel