Allow installing next-firebase-auth in a Next v13 project

[bourquep]

Is your feature request related to a problem? Please describe.

I have tried to nom install next-firebase-auth in a brand new NextJS v13 project, and it failed due to this peer dependency constraint.

Describe the solution you'd like and how you'd implement it

Although NextJS 13 introduces the new app directory feature, this is opt-in only and there are no breaking changes in the other aspects of NextJS. I believe next-firebase-auth should be usable with NextJS 13 regular pages.

I suggest updating next-firebase-auth's peer dependency to allow NextJS v13.

Is this a breaking change?

No

[kmjennison]

Thanks for the issue!