feat: Add full support for Laravel 11

[siketyan]

Laravel 11 has been released with these new methods:

• Authenticatable::getAuthPasswordName
• AuthUserProvider::rehashPasswordIfRequired

These are not implemented yet in this library, so upgrading to Laravel 11 causes a PHP fatal error on the implementors:

PHP Fatal error:  Class App\Models\User contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Illuminate\Contracts\Auth\Authenticatable::getAuthPasswordName) in [REDACTED]

This pull requests adds full support of Laravel 11 by adding implementation for these methods.