fix(secret): openbao implementation wrong fs write call on windows

harmony_secret/src/store/openbao.rs

@@ -183,7 +183,7 @@ impl OpenbaoSecretStore {
         }
         #[cfg(not(unix))]
         {
-            fs::write(path, token)?;
+            fs::write(path, serde_json::to_string(token)?.as_bytes())?;
         }
         Ok(())
     }