Fixed implicitly declared nullable arguments, improves compatibility …

[hostep]

…with PHP 8.4

Found with PHPCompatibility phpcs standard (develop branch)

$ vendor/bin/phpcs --standard=PHPCompatibility --extensions=php,phtml --runtime-set testVersion 7.4- .

FILE: Plugin/TriggerAddGuestPaymentInfoDataLayerEvent.php
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 34 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $billingAddress.
 52 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $billingAddress.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


FILE: Plugin/TriggerAddPaymentInfoDataLayerEvent.php
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 37 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $billingAddress.
 61 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $billingAddress.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Time: 608ms; Memory: 6MB

Ref: https://wiki.php.net/rfc/deprecate-implicitly-nullable-types

[jissereitsma]

Thanks for addressing this. Earlier, I checked things with the PHPCompatibility rules already, but not the development version. And the Magento clone is strongly outdated. I now incorporated the dev branch in my own release tool, so future checking upon compat is guaranteed.

Sorry for closing the PR. I already fixed this myself, only to find that you had a fix as well. A new release is now available with these fixes.