fetch-watch-tags only reports on the most recent version series
Yesterday, we had GitLab 13.7.9 and 13.9.4. The bot is supposed to create an issue for each, as it is currently watching the 13.7 and 13.9 series, but it reported only 13.9.4.
Reason is quite obvious:
new_versions = [max(v for v in new_versions if v[:2] in series)]