Rails 7 support

[tachyons]

Steps to reproduce

try to add this gem in a rails 6 project

Expected behavior

It works

Actual behavior

bundle fails to resolve

[simukappu]

Thank you for creating this issue and your PR. We'd like to allow use with Rails 7.0, but the gem is not tested with Rails 7.
Can you add test gemfile to gemfiles directory and confirm if it works fine?

[simukappu]

I've allowed use with Rails 7.0 in master branch.

The latest devise_token_auth does not support Rails 7.0 yet. The pull request has been already merged into master branch.
Also the latest mongoid does not support with Rails 7.0 yet. The feature request was opened and the commit has been already merged into master branch.

[simukappu]

We've published as v2.2.3.