replace hetzner-hel1-03
during the recent flood related to the TB 12 release (#40996), it became obvious that hetzner-hel1-03 wasn't capable of supporting the load other mirrors are going through. its traffic shot up to 50mbps, but the load went up to 100 without being able to max its network connexion.
consider retiring the server or recreating it with more capacity. see https://gitlab.torproject.org/tpo/tpa/team/-/issues/40996#note_2861314 for more details.