Wrong PHPDoc type for id (int instead of int|string or mixed) causes PHPStan errors

**Description:**
In the code, the PHPDoc for `id` is hardcoded as `int`.
Since our project also uses UUIDs as IDs, this results in PHPStan errors.

**Example:**
https://github.com/404labfr/laravel-impersonate/blob/5033f3433a55ca8bb2cc3e4a018a39dd8a327a9f/src/Services/ImpersonateManager.php#L28C15-L28C19

**Expected behavior:**
The PHPDoc type should allow UUIDs (e.g. `string|int` or a more suitable type) so PHPStan does not report errors. Laravel uses the type `mixed`.