NodeJS/Authentication - Update authentication_basics.md

[WillAvatec]

Because

The stated way to set the connection to MongoDB with mongoose in the lesson is outdated as per this link:

https://mongoosejs.com/docs/migrating_to_6.html#no-more-deprecation-warning-options

The docs shows that the options were deprecated on Mongoose 6, since we're in version 7. I'm assuming we're long past that point.

Additional Information

Lesson link: https://www.theodinproject.com/lessons/nodejs-authentication-basics#set-up

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[wise-king-sullyman]

Seems like a needed change to me, thanks!