Bump to 1.2.3 for the connectivity release (#33)

Everything since 1.2.2 is about nodes being able to find and reach each other,
which is the problem this project actually had:

  #30  rendezvous registration and waiting split apart. Registering used to
       block until somebody dialled, so a node could not advertise a meeting
       node until it had already been reached at one. This is the root cause
       of the flaky connectivity, not dead relays or stale descriptors.
  #26  a node no longer advertises a rendezvous it is not registered at
  #25  .btf peers that answered are remembered and dialled first (36.3s -> 2.1s)
  #32  peers exchange signed descriptors, so discovery survives a relay outage
  #29  debug.log stopped dropping lines under concurrency
  #28  /port, so two nodes can share a machine

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