PHP 8.4 deprecations

[Soean]

I see deprecations with PHP 8.4:

PHP Deprecated: Brain\Nonces\WpNonce::validate(): Implicitly marking parameter $context as nullable is deprecated, the explicit nullable type must be used instead in /var/www/vendor/brain/nonces/src/WpNonce.php on line 68

public function validate(NonceContextInterface $context = null)

Nullables is only allowed since PHP 7.1, this package supports PHP >=5.5.0.