Ubuntu noble and resolute repro builds pull from updates

[daywalker90]

Ubuntun noble and later use the new deb822 format for sources and our repro builds do not properly disable updates for them which in turn leads divergences in the hash locked dependencies.

We should adapt the repro build to also disable updates in this new sources format.

cat /etc/apt/sources.list
 # Ubuntu sources have moved to the /etc/apt/sources.list.d/ubuntu.sources 
 # file, which uses the deb822 format. Use deb822-formatted .sources files
 # to manage package sources in the /etc/apt/sources.list.d/ directory.

[daywalker90]

Was only the case when Dockerfiles were still referencing non-debootstrapped images. With debootstrap they are still using the old format.