fix: replace non-canonical (integer) cast deprecated in PHP 8.5

[wombatbuddy]

PHP 8.5+ deprecates non-canonical type cast aliases (integer), (boolean), (double) and (binary). Using these aliases produces a deprecation notice on PHP 8.5+ which will become a fatal error in a future PHP version.

Steps to reproduce

1. Run tests on PHP 8.5:
   vendor/bin/phpunit --display-deprecations

2. You will see:
   Non-canonical cast (integer) is deprecated, use the (int) cast instead

   • src/Network.php:377
   • src/Range.php:240

Solution

Replace with canonical alias:
(integer) → (int)

References

1. https://php.watch/versions/8.5/boolean-double-integer-binary-casts-deprecated
2. https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_non-standard_cast_names

Note on maintainability

Meanwhile, a compatible fork is available at: https://packagist.org/packages/wombatbuddy/iptools