Release of libvirt-php-0.5.6

The 0.5.6 release of libvirt-php is tagged and tarball is available at: https://libvirt.org/sources/php/ Notable changes: * PHP-8.0 support * Implemented virDomainSnapshotCurrent() API * Implemented virNetworkGetDHCPLeases() API * Implemented virDomainGetCPUStats() API * Implemented virDomainUndefineFlags() API * Fixed libvirt_domain_interface_addresses() when multiple addresses are reported * Bug fixes Thanks to everybody who helped with this release. Michal