fix: crypto is not defined

backend/src/user/user.service.ts

@@ -1,6 +1,7 @@
 import { BadRequestException, Injectable } from "@nestjs/common";
 import { PrismaClientKnownRequestError } from "@prisma/client/runtime";
 import * as argon from "argon2";
+import * as crypto from "crypto";
 import { EmailService } from "src/email/email.service";
 import { PrismaService } from "src/prisma/prisma.service";
 import { CreateUserDTO } from "./dto/createUser.dto";