script: Add python3-debian package to PKG_ESSENTIALS_DEBIAN
script: Add python3-debian package to PKG_ESSENTIALS_DEBIAN

To support security update reository, python3-debian is
used to compare debian package versions.

Signed-off-by: Masami Ichikawa <c2473eda382716382abb3daa8176411f9c82916d@miraclelinux.com>

meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian