Add dotenv loading to migration script

scripts/migrate-aes-cbc-to-gcm.ts

@@ -8,6 +8,7 @@
  * Usage:
  *   npx tsx scripts/migrate-aes-cbc-to-gcm.ts
  */
+import "dotenv/config";
 import { createCipheriv, createDecipheriv, createHmac, randomBytes, timingSafeEqual } from "node:crypto";
 import { prisma } from "../src/lib/prisma";