chore(svc): replace deprecated fetch_update with try_update (#3407)

Signed-off-by: Qsie <[email protected]>

fluxer_users/src/shard_impl.rs

@@ -214,7 +214,7 @@ impl UserCaches {
     async fn invalidate(&self, user_id: i64) {
         let generation = self
             .generation(user_id)
-            .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |current| {
+            .try_update(Ordering::SeqCst, Ordering::SeqCst, |current| {
                 current.checked_add(1)
             })
             .expect("user cache generation exhausted");