Merge pull request nestjs#2243 from saarw/fix-jwt-deprecation

fix(sample): update sample to avoid deprecated secretOrPrivateKey

Author: kamilmysliwiec

sample/19-auth/src/auth/auth.module.ts

@@ -9,7 +9,7 @@ import { JwtStrategy } from './jwt.strategy';
   imports: [
     PassportModule.register({ defaultStrategy: 'jwt' }),
     JwtModule.register({
-      secretOrPrivateKey: 'secretKey',
+      secret: 'secretKey',
       signOptions: {
         expiresIn: 3600,
       },