The `typo3/minimal` package is not maintained very much, and currently
cannot be used as a requirement to install the latest TYPO3 development
version (as it still depends on `dev-master`, not on `dev-main`).
In addition, not depending on it will allow us to find any missing
dependencies in our requirements that so far have been masked by
the `typo3/minimal` dependencies.
(This is the same as #520, but for GitLab CI.)