lexicons: re-vendor org.tangled at a newer Tangled commit #1365

The vendored org.tangled lexicons are pinned to Tangled 51f4e39e4. Since then, repo.artifact gained a 255-character name limit, and track.defs added assignees to ticketView. Neither changes atgc's behaviour today: it reads artifacts without enforcing the limit, and reads assignees through its own Bobbin struct.

Re-vendor at Tangled cb477649a, or later, for tidiness. Coordinate with any open change that touches vendor/.