community/php81: security upgrade to 8.1.28

• CVE-2024-1874
• CVE-2024-2756
• CVE-2024-3096

Added patch to allow build with fresh libxml https://github.com/php/php-src/commit/0a39890c967aa57225bb6bdf4821aff7a3a3c082 and for tests

• https://github.com/php/php-src/commit/061058a9b1bbd90d27d97d79aebcf2b5029767b0
• https://github.com/php/php-src/commit/11caf094f1af6b47ea2138c5fa907838911ebe01