Bug 28386: Some manual removals from contributors.yaml

Bug 28386: Some manual removals from contributors.yaml

Those are not real authors and should be removed from the
contributors.yaml file

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit b8818ac568657bc114ee1468de9d86fc27d477cb)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 4487ee4928e2ff686387300a5ac601f141b37298)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>