chore(typescript/rest-nestjs): remove unused dependency

[Changhun Lee]

Hi :)
I noticed an unused INestApplication dependency in the typescript/rest-nestjs example project.
I've removed the unused INestApplication import from the codebase.
If my contribution is helpful to you, that would be great!

• https://github.com/prisma/prisma-examples/blob/latest/typescript/rest-nestjs/src/prisma.service.ts

import { Injectable, OnModuleInit, INestApplication } from '@nestjs/common' // `INestApplication` unused !
import { PrismaClient } from '@prisma/client'

@Injectable()
export class PrismaService extends PrismaClient implements OnModuleInit {
  async onModuleInit() {
    // Note: this is optional
    await this.$connect()
  }
}