Upgrade to V4 error incompatible declaration

[SkyZy]

Declaration of App\Models\Activity::getExtraProperty(string $propertyName) must be compatible with Spatie\Activitylog\Contracts\Activity::getExtraProperty(string $propertyName, mixed $defaultValue): mixed {"exception":"[object] (Symfony\Component\ErrorHandler\Error\FatalError(code: 0): Declaration of App\Models\Activity::getExtraProperty(string $propertyName) must be compatible with Spatie\Activitylog\Contracts\Activity::getExtraProperty(string $propertyName, mixed $defaultValue): mixed at D:\web\app\Models\Activity.php:47)

[github-actions]

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