Shorten cryptoki pin debug display placeholder

Signed-off-by: Marcel Guzik <marcel.guzik@cumulocity.com>

Author: Bravo555

crates/extensions/tedge-p11-server/src/pkcs11.rs

@@ -29,13 +29,23 @@ use std::sync::Mutex;
 use tracing::debug;
 use tracing::warn;
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 pub struct CryptokiConfigDirect {
     pub module_path: Utf8PathBuf,
     pub pin: AuthPin,
     pub serial: Option<Arc<str>>,
 }
 
+impl Debug for CryptokiConfigDirect {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("CryptokiConfigDirect")
+            .field("module_path", &self.module_path)
+            .field("pin", &"[REDACTED]")
+            .field("serial", &self.serial)
+            .finish()
+    }
+}
+
 #[derive(Debug)]
 pub enum Pkcs11SigningKey {
     Rsa(RSASigningKey),