updated dates in various info.txt files

lib/plugins/acl/plugin.info.txt

lib/plugins/authad/plugin.info.txt

lib/plugins/authldap/plugin.info.txt

lib/plugins/authmysql/plugin.info.txt

lib/plugins/authpgsql/plugin.info.txt

lib/plugins/authplain/plugin.info.txt

lib/plugins/config/plugin.info.txt

lib/plugins/extension/plugin.info.txt

lib/plugins/info/plugin.info.txt

lib/plugins/popularity/plugin.info.txt

lib/plugins/revert/plugin.info.txt

lib/plugins/styling/plugin.info.txt

lib/plugins/usermanager/plugin.info.txt

lib/tpl/dokuwiki/template.info.txt