First major of this fork line. Everything below is a BC break relative to 1.9.1.
Removed the db-connected surface — DbConnectedResource, DbConnectedResourceAbstractFactory, TableGatewayAbstractFactory, the (already commented-out) abstract_factories registrations and the api-tools.db-connected sample config. This drops the direct requirements on laminas/laminas-db and laminas/laminas-hydrator; laminas-db leaves the install tree entirely, laminas-hydrator remains via other requirers.
Removed MongoConnectedListener and the alcaeus/mongo-php-adapter suggest. Not dead code: that shim provides MongoCollection on PHP 8, so the listener was instantiable for anyone who took the suggestion up.
Removed the ServiceManager v2 back-compat shims and migrated off the abandoned container-interop/container-interop to Psr\Container.
Constraints on sibling forks widened to accept their new majors.