[php-src] Issue #22161: PHP 8.5 broke SoapServer::handle()

Issue: https://github.com/php/php-src/issues/22161
Author: langemeijer

### Description

`SoapServer::handle()` is not behaving as expected in my situation. This was introduced in PHP 8.5

I had something similar to:
```php
    $server = new SoapServer($myWsdlFile);
    $server->setClass($myClassName);
    $server->handle();
```

As documented `$server->handle()` without parameter should get body contents, but that seems to have broken. I changed my code to:

```php
    $server->handle($request->getBody()->getContents());
```
And now it's working again.

I'm suspecting commit f538319263e75c2b10a85f3b5a7b8bd204682c41 by @ndossche but I'm not sure.


### PHP Version

```plain
PHP 8.5.5
```

### Operating System

_No response_