debian/control: No longer depend on debconf (Closes #1006492)

In 2007 cdebconf has been "temporarily" made to depend on debconf

to avoid anyone breaking their systems by removing debconf, which dependencies now allow.

(See commit b4dfa070)

Now, 15 years and various Debian releases later, all packages in the base system depend on some variation of debconf | debconf-2.0.

This hard-dependence can now be removed.

added 9 commits

• edfbbdf6...e99c4ec7 - 8 commits from branch installer-team:master
• ddb3fe8b - debian/control: No longer depend on debconf (Closes #1006492)

Compare with previous version

merged

mentioned in commit 33a99943

Thanks @holgerw for the merge. Beware that this fix is only a piece of the puzzle: MR !17 and the others mentioned in https://lists.debian.org/debian-boot/2022/08/msg00135.html must also be merged in in order to install packages without classic debconf.