router_new_address_suggestion is not IPv6 aware
I see this in the debug log when using an IPv6 bridge. I censored the addresses but they are well-formed IPv6 addresses in the log.
Jan 08 12:49:16.000 [debug] connection_dir_client_reached_eof(): Received response from directory server '2600:3c01::...:9001': 200 "
OK" (purpose: 6)
Jan 08 12:49:16.000 [debug] router_new_address_suggestion(): Malformed X-Your-Address-Is header "2001:470::...". Ignoring.
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