Comment # 2 on bug 1136051 from Ladislav Slez�k

Fixed in yast2-packager-4.2.8 (https://github.com/yast/yast-packager/pull/442),
that should decrease the needed memory, 1GB should be enough again.

(The memory constant has been fixed in yast2-packager-4.2.9,
https://github.com/yast/yast-packager/pull/443)