[Filters] OrderFilter causes deprecation warnings on PHP 8.5

[burned42]

API Platform version(s) affected: 4.2.15

Description
I am running on PHP 8.5 and my log fills up with these deprecation messages:

Using null as an array offset is deprecated, use an empty string instead

from vendor/api-platform/doctrine-orm/Filter/OrderFilter.php line 241

The part of the code causing this issue seems to be

$context['filters'][$parameter?->getProperty()]

Where in this case $parameter seems to be null, so it uses null as an array offset, which is deprecated since PHP 8.5:
https://www.php.net/manual/de/migration85.deprecated.php#migration85.deprecated.core.using-null-as-an-array-offset

As every request that uses this order filter triggers a deprecation warning, this fills up my deprecation log file quite a lot.

How to reproduce
This is caused by this ApiFilter attribute using the OrderFilter class:

#[ApiFilter(
    filterClass: OrderFilter::class,
    properties: [
        'createdAt',
        'updatedAt',
    ],
)]

Possible Solution
Verify that the variable used as array offset is not null before trying to access the array offset.

[burned42]

I just saw this was fixed already on main in 5c9bb34 (in particular this commit from the related PR: 89b992d )

But it's not part of the 4.2 branch and therefore also not part of any 4.2 release yet.

[burned42]

Maybe that commit could just be cherry-picked into 4.2?

According to the composer.json branch 4.2 is compatible with PHP 8.5 so it would be nice to get the deprecations fixed in there as well if there are no downsides/objections.