Updates brumann/polyfill-unserialize to 1.0.4
Updates joomla/utilities to 1.6.1 (fixes failing tests in #25520)
Updates joomla/string to 1.4.3
Updates symfony/polyfill-ctype to 1.12.0
Updates symfony/polyfill-php55 to 1.12.0
Updates symfony/polyfill-php56 to 1.12.0
Updates symfony/polyfill-php71 to 1.12.0
Updates symfony/polyfill-php73 to 1.12.0
Updates symfony/polyfill-util to 1.12.0
Testing Instructions
polyfill-unserialize is only used by TYPO3\PharStreamWrapper\Phar\Manifest. Not sure how to test this.
For the other test that Joomla\Utilities\IpHelper functions still work.
Closed in favor of #26000.