PHP 8.4 support

[mrFANRA]

Hi!

Here is few deprecation messages.

Deprecated: can_impersonate(): Implicitly marking parameter $guard as nullable is deprecated, the explicit nullable type must be used instead

Deprecated: can_be_impersonated(): Implicitly marking parameter $guard as nullable is deprecated, the explicit nullable type must be used instead

Deprecated: is_impersonating(): Implicitly marking parameter $guard as nullable is deprecated, the explicit nullable type must be used instead

Needs little changes:

function can_impersonate(string $guard = null): bool 
// =>
function can_impersonate(?string $guard = null): bool

[MarceauKa]

Thank you for this