chore: bump version to 2.19.3 in package.json and optimize nonce veri… (#401)

* chore: bump version to 2.19.3 in package.json and optimize nonce verification logic in SQL schema

- Incremented application version from 2.19.2 to 2.19.3 in package.json.
- Enhanced nonce verification function in 12-one-time-tokens.sql for improved performance and concurrency handling.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "next-supabase-saas-kit-turbo",
-  "version": "2.19.2",
+  "version": "2.19.3",
   "private": true,
   "sideEffects": false,
   "engines": {