fix login tests and github actions workflow

[ch4r-ch4r]

1. Fixed the following tests:

• registers a new user and logs in
• registers a new user with password confirmation and logs in
• User logs in when two factor disabled, the login.id session should not be created
• User logs in without 2FA, they should not be redirected to auth/two-factor-challenge page
• Replaced: ->assertRedirect('/'); with: ->assertRedirect(config('devdojo.auth.settings.redirect_after_auth')); This accounts for when a user has set a custom redirect_after_auth value.

2. Add check for copying existing.env or .env.example file before listing it (in case the .env does not exist.

3. Add Dusk and DuskApiConfig to PestPHP install step, otherwise the tests fail because they have not been installed.

4. Update checkout version to 4 (v2 will be depecrated soon)

5. Update php version to 8.3

[bobbyiliev]

Looks good! Thank you!