[13.x] Fix middleware type error

[axlon]

Passport's changed middleware incorrectly assumes OAuthenticatable::currentAccessToken() returns an instance of AccessToken, when it actually returns any implementation of ScopeAuthorizable (which includes TransientToken). This PR fixes the TypeError that arises when the user has a token set that is not of type AccessToken.

Note that this is a potential breaking change for anyone that is extending the middleware on 13.0.0 (which is probably not many people since its not been out for long). However, I don't see any other way to fix this TypeError and not fixing this means you'd have to use your own middleware if you wanted to use TransientToken or a custom token implementation

[axlon]

Error in question:

[2025-05-07 09:35:41] local.ERROR: Laravel\Passport\Http\Middleware\ValidateToken::validateToken(): Return value must be of type Laravel\Passport\AccessToken, Laravel\Passport\TransientToken returned {"userId":1,"exception":"[object] (TypeError(code: 0): Laravel\Passport\Http\Middleware\ValidateToken::validateToken(): Return value must be of type Laravel\Passport\AccessToken, Laravel\Passport\TransientToken returned at /Users/choraimy/Sites/project/vendor/laravel/passport/src/Http/Middleware/ValidateToken.php:63)