It’s looking for the file here /var/www/wordpress/wp-load.php
It should probably be looking for it here /srv/www/domain.dev/current/web/wp/wp-load.php
(I’m making a few assumptions here, most significantly that you’re using Bedrock)
More specifically, even if that file does exist where it’s looking, it’s not going to be able to access it because PHP doesn’t have access to that path. Your open_basedir is set to /srv/www/:/tmp which means PHP can only access files within /srv/www/ and /tmp.
/var/www/wordpress/ is outside of those paths. (note /srv/www vs /var/www)
Based on what you’ve posted, I’d guess that it’s looking in a hard-coded path or it’s a path that was saved to the database and you need to update it. Either way, that plugin is doing it wrong so you’ll have to patch it or go yell at the plugin author.