Drop Zend Diactoros support and mark newer versions of discovery as conflicting with it.
Why?
Zend diactoros got renamed to laminas diactorors and the old zend version is no longer maintained. The priorities if both are installed is to pick zend over laminas. Rather than change priorities, we just drop zend support.
Checklist
[x] Updated CHANGELOG.md to describe BC breaks / deprecations | new feature | bugfix
[x] Documentation pull request created (if not simply a bugfix)
What's in this PR?
Drop Zend Diactoros support and mark newer versions of discovery as conflicting with it.
Why?
Zend diactoros got renamed to laminas diactorors and the old zend version is no longer maintained. The priorities if both are installed is to pick zend over laminas. Rather than change priorities, we just drop zend support.
Checklist