community/bareos: should use php81 instead of php8

In 1 month PHP 8.0 will loose active support but security fixes will be backported one more year according to https://www.php.net/supported-versions.php

This is the only blocker left to move php8 out of community and start adoption of php82 which will be released on Nov 24 https://wiki.php.net/todo/php82 the same time as 3.17 release

If there's no way to fix it we can keep 8.0 in community one more year...

But it's not (and will not be) compatible with OpenSSL 3.0 (we using lots of patches to make it work somehow) https://www.php.net/manual/en/openssl.requirements.php