[php-src] Issue #20624: No method to close curl_share_init_persistent()

Issue: https://github.com/php/php-src/issues/20624
Author: kkmuffme

### Description

There's no method to close/end `curl_share_init_persistent()`, which means DNS expiration has to be awaited and all open connections are retried (and closed) unnecessarily even when one already knows (and could directly close them) - the only fix is to restart php-fpm?


### PHP Version

```plain
PHP 8.5
```

### Operating System

_No response_