security/vaultwarden: permit to build with rust 1.79.0

no specific bump as _SYSTEM_VERSION-rust has just been bumped

security/vaultwarden/patches/patch-src_main_rs

@@ -0,0 +1,13 @@
+unbreak the build with lang/rust 1.79.0
+
+Index: src/main.rs
+--- src/main.rs.orig
++++ src/main.rs
+@@ -42,6 +42,7 @@ use tokio::{
+ #[macro_use]
+ mod error;
+ mod api;
++#[allow(unused)]
+ mod auth;
+ mod config;
+ mod crypto;