[GIT-PULLS] [php-src] PR #23481: ext/ftp: validate $port range before narrowing to short in ftp_connect/ftp_ssl_connect

Pull Request: https://github.com/php/php-src/pull/23481
Author: lacatoire

`ftp_connect()` and `ftp_ssl_connect()` accept `$port` as `zend_long` but cast it to C `short` at the `ftp_open()` call site without range-checking first. Values outside 0–65535 silently wrap: `65536` narrows to `0`, which `ftp_open()` rewrites to `21`, connecting to the FTP control port regardless of what the caller requested.

The fix validates `$port` before the cast and throws a `ValueError` for out-of-range values, consistent with how other extensions handle integer narrowing.

A test covering the boundary and the silent-wrap case is added.