Release mktemp version 1:1.6-4+apertis3

• Don't declare a minimal coreutils version since this has negative effects when building docker image.
• Override depends-on-essential-package-without-using-version instead.
• Add rust-coreutils as a preferred alternative to coreutils-gplv2 and coreutils.

https://phabricator.apertis.org/T9652