Can not build dev docs with recent PHP version

[nickvergessen]

Your lock file does not contain a compatible set of packages. Please run composer update.

Problem 1 - leafo/scssphp is locked to version dev-master and an update of this package was not requested. - leafo/scssphp dev-master requires php ^5.4.0 || ^7 -> your php version (8.0.16) does not satisfy that requirement. Problem 2 …

Seems like the deps need a bump: https://github.com/nextcloud/documentation/blob/e62af941d49e509259ae906f2e667de669c108e4/build/composer.json#L13