PHP version, return just the semver version

[rogervila]

When running php -v, the original output is too verbose:

PHP 8.5.12 (cli) (built: Oct 22 2026 10:11:20) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.5.12, Copyright (c) Zend Technologies
    with Xdebug v3.5.3, Copyright (c) 2002-2026, by Derick Rethans
    with Zend OPcache v8.5.12, Copyright (c), by Zend Technologies

rtk php -v might return the semver version without additional decorations: 8.5.12

[rogervila]

Fixed in #5029