devel-docs: add the package maintainers in the release-howto.
Nicknames on IRC/gitlab are hard, even more when they change depending on the media! I realize we are regularly asking them or unsure of who to contact (for instance here for releases). Let's associate each package with its current maintainer to make it easy to contact the right person to prepare our official packages before a release. (cherry picked from commit dc9a3044)
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