update to 2.12.0
    
    keep compatibility using laminas-zendframework-bridge
      as this is only used using compat autolader
    add dependency on laminas-code
    raise dependency on laminas-http 2.15
    raise dependency on laminas-math 3.4
    raise dependency on laminas-server 2.11
    raise dependency on laminas-stdlib 3.6.1
    raise dependency on laminas-xml 1.4