lxc: update dependencies

Signed-off-by: Luka Perkov <luka@openwrt.org>
luci-app-lxc: update dependencies

Signed-off-by: Luka Perkov <luka@openwrt.org>
luci-app-lxc: add spdx license info

Signed-off-by: Luka Perkov <luka@openwrt.org>