Some relays have last_restart attribute older than the first_seen attribute

@gus has found a relay that has ifs 'first seen' attribute equals to 2021-12-06, but the 'last restart' to 2021-11-29.

https://metrics.torproject.org/rs.html#details/F3ED9FE52BBCB8E1662BF61346BF1FE708997EB5

I wonder if this is a bug in how the first_seen attribute is set.

For relays see:

https://gitlab.torproject.org/tpo/network-health/metrics/onionoo/-/blob/master/src/main/java/org/torproject/metrics/onionoo/updater/NodeDetailsStatusUpdater.java#L281

For bridges see:

https://gitlab.torproject.org/tpo/network-health/metrics/onionoo/-/blob/master/src/main/java/org/torproject/metrics/onionoo/updater/NodeDetailsStatusUpdater.java#L389