lower dependency on PHP 8.0

lower dependency on PHP 7.3

raise dependency on PHP 7.4
raise dependency on laminas-stdlib 3.7.1
open https://github.com/laminas/laminas-db/issues/241
  CI seems broken (2.14 is unusable)

keep compatibility using laminas-zendframework-bridge
  as this is only used using compat autolader
raise dependency on laminas-stdlib 3.6

raise dependency on PHP 7.3
raise dependency on laminas-stdlib 3.3
allow laminas-hydrator v3 and v4
switch to phpunit9