packaging-data-fetch-downstream: Fetch all branches and tags
The Python GitLab API is paginated by default, so you may not get all
results unless you use the all=True
parameter.
This affected the firefox-esr
package: since it is frequently updated
in Debian, not all tags for the debian/buster
were returned, and in
particular the one pointing to the branch head was missing leading the
sanity-check step to complain.