Install reprepro from Collabora repos

Andrej Shadurarequested to merge
fix-reprepro into collabora/staging

The version of the package in Trixie does not include this commit in use by OBS reprepro integration:

https://salsa.debian.org/debian/reprepro/-/commit/fad429f20868ea23edc7f914361fceab846a47f3

Debian bug: http://bugs.debian.org/697630

Edited by Andrej Shadura

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