The update_responses script should use mar-tools from the release`s directory
The current version of the update_responses
script is using the mar-tools from the path ../../../gitian-builder/inputs/mar-tools-linux64.zip
.
This works fine when a build with the correct version has been done before from this directory, but this is not always the case.
Instead, it should be using the mar-tools-linux64.zip
from the release`s directory.
This should also help for #17381 (moved).