Re-add FOR NO KEY UPDATE to FETCH_QUERY_UPDATE

Signed-off-by: Robbie Blaine <robbieblaine.rb@gmail.com>

askar-storage/src/backend/postgres/mod.rs

@@ -100,7 +100,7 @@ const FETCH_QUERY_UPDATE: &str = "
         *
     FROM
         fetched_data
-    FOR UPDATE";
+    FOR NO KEY UPDATE";
 const INSERT_QUERY: &str = "INSERT INTO items (profile_id, kind, category, name, value, expiry)
     VALUES ($1, $2, $3, $4, $5, $6)
     ON CONFLICT DO NOTHING RETURNING id";