keep compatibility using laminas-zendframework-bridge
  as this is only used using compat autolader
raise dependency on PHP 7.4
raise dependency on laminas-escaper 2.9
raise dependency on laminas-stdlib 3.6

  https://github.com/laminas/laminas-tag/pull/6

raise dependency on PHP 7.3
raise dependency on laminas-escaper 2.7
raise dependency on laminas-stdlib 3.2
switch to phpunit9