Sorry for not identifying this earlier (`composer update` does not list
every incompatibility at once but rather displays another one after the
1st one is fixed).
We have the same issue as with phan/phan: pdepend/pdepend is not yet
compatible with Symfony 8, but it does not seem to be used by
php-spider.
I move it to dev dependencies, but you may want to remove it completely?
Or call `vendor/bin/pdepend` in the tests and do something with the
output?
Best regards